The Army Basing Programme, Stonehenge and the Emergence of the Sacred Landscape of Wessex

Recent excavations for the Army Basing Programme on the periphery of the Stonehenge World Heritage Site have revealed extensive evidence of Early, Middle and Late Neolithic and Early Bronze Age activity, including a causewayed enclosure, burials, occupation, pit groups, henges, post alignments and circles. Several of these either incorporate or refer to features of the landscape such as solution hollows, dry valleys, hilltops and rivers, as well as to astronomical phenomena. An appraisal of this evidence alongside other recent programmes of research around Stonehenge suggest an accreting pattern of development of this landscape that begins in the 38th century BC, and which throws new light on the location and meaning of several of the ceremonial earthworks, including Stonehenge itself.


Introduction
A recent programme of survey and excavation carried out by Wessex Archaeology as part of the Ministry of Defence's Army Basing Programme revealed a wealth of archaeological remains including a causewayed enclosure, henges, pits and burials. These results have demonstrated that some of the key relationships and foundational principles of the Stonehenge landscape pre-date the earliest phases of Stonehenge itself by at least 600 years, and that the development of the ceremonial landscape was an intermittent but continuous process of working and reworking over millennia, away from, as well as at, Stonehenge.
Throughout this article, Lark Hill refers to the landscape feature and any archaeology discovered on it, Larkhill to the military garrison town.

The Army Basing Programme
Aspire Defence, Lovell Partnerships and WYG commissioned Wessex Archaeology on behalf of Defence Infrastructure Organisation to carry out archaeological investigations ahead of development for the Army Basing Programme. These works collectively involved an ambitious project to accommodate the 4000 additional Service personnel and their families based on and around Salisbury Plain from 2019. Excavations took place in and around the existing military bases at Larkhill, Bulford, Tidworth and Perham Down, with ancillary works at Ludgershall and between Bulford and Tidworth ( Figure 1). Figure 1: Location of the Army Basing Programme archaeological works and key places mentioned in the text As a whole, the Programme revealed evidence of the human use of the area from the Early Neolithic to the Second World War, with important evidence of the development of infantry warfare during World War 1 being a particularly significant result from Larkhill (Brown and Thompson 2018). Preliminary results and summaries are available (Leivers 2017a;2017b;Brown and Thompson 2018), while an Early Bronze Age possible log burial has been published in full (Powell and Legg 2020). This article discusses the major discoveries dating to the Neolithic and Early Bronze Age from these excavations, and attempts to set them in the wider context of the landscape preceding Stonehenge, of Stonehenge itself, and of the development of the ceremonial landscape into the Early Bronze Age. Full publication of the Programme's results will follow an extensive programme of post-excavation analysis.
2. Before Stonehenge -the Early Neolithic (38th to 33rd centuries BC) Lark Hill is a low eminence that currently forms part of the northern boundary of the Stonehenge World Heritage Site. The Stonehenge Riverside Project identified the southeastern end of the hill over a decade ago as a key point in the Stonehenge landscape: the spot commands 'dramatic viewsheds of round barrow cemeteries as well as the major monuments, including a midwinter sunset solstice vista along the Avenue and into Stonehenge' (Parker Pearson et al. 2004, 54;2020, 26). This understandable focus on Stonehenge is perhaps what diverted attention away from Lark Hill's north-eastern slopes (from which Stonehenge is not visible), where some remarkable Early Neolithic evidence is situated, including a newly discovered causewayed enclosure ( Figure 2).

The Lark Hill causewayed enclosure
A 125m long gently curving arc of five segments of ditch lay within the limit of excavation, with the rest of the circuit and almost the entire interior uninvestigated within the Ministry of Defence's Larkhill Camp. This means that the enclosure's size and morphology is mostly unknown: the possibility of multiple ditch circuits remains untested, as does the existence of any internal features. All that can be said for certain is that the segments of ditch within the excavations are the outer circuit on the north-east side (no further circuits were found within the extensive excavated areas outside the enclosure), and that, assuming a reasonably circular shape, the enclosure sat on the north-western summit of Lark Hill and partly on its northern slope ( Figure 2). This location places it above the head of a dry valley that may have been seasonally wet and which leads down to a large meander in the Avon. A cattle tibia from a Hembury Ware-containing fill low in the sequence (but not on the ditch bottom) provides a date for the enclosure. This bone produced an unmodelled radiocarbon date of 3780-3650 cal BC (SUERC-70507: 4937±31 BP), providing a terminus post quem for the original fills of the ditch. This date makes the enclosure one of the two earliest dated Neolithic structures currently known in the Stonehenge environs, along with the Coneybury 'Anomaly' which has modelled dates between 3800-3700 cal BC (95% probability) or more likely between 3760-3700 cal BC (68% probability) ).

☞ The causewayed enclosure's relationship to the wider landscape
There are other suggestions of a date at the very beginning of the period for the Lark Hill enclosure. The viewshed seen in Figure 3 was constructed using a grid of observer points with the eye level at 1.6m above the surface over an approximately circular structure of comparable size to the enclosure at Robin Hood's Ball, around an estimated centre point at NGR 414091 144275, using a bare earth elevation model. Figure 3 shows the undated Knighton (FIG27) and Larkhill Camp (DUR24) long barrows on islands of visibility in locations that are unlikely to be coincidental, implying that the causewayed enclosure already existed at the time of their construction. It may be significant in view of the argument advanced below that the locations of both ends of the Stonehenge Cursus as well as the entire length of the Lesser Cursus (both later structures) are likely to have been visible.
Longer-distance instances of intervisibility are also apparent. The military track from Knighton Farm and 'C' Crossing to Allanbrooke Barracks and Knighton long barrow follows the ridgeline forming the northern slope of the dry valley at the head of which the Lark Hill enclosure sits. The enclosure is on the near horizon to the south, the northern horizon marked by the edge of the Marlborough Downs. Both Adam's Grave and the causewayed enclosure on Knap Hill are clearly visible from this point at a distance of almost 20km. Evaluation on the 'C' Crossing ridge has found at least one pit containing Early Neolithic flint work (Wessex Archaeology 2001).

Figure 4: A viewshed for the enclosure at Robin Hood's Ball
A comparison of the viewsheds of the region's two causewayed enclosures is instructive. Viewsheds for the Robin Hood's Ball enclosure have been published in Batchelor 1997, plan 7 andExon et al. 2000, 33, fig. 4.3; a new version from a grid of observer points across the Robin Hood's Ball enclosure is in Figure 4. An overlay of the viewsheds for Robin Hood's Ball and Lark Hill is in Figure 5 (a larger scale detailed zoomable viewshed for the Lark Hill enclosure is also included - Figure 5a). Neither enclosure is visible from the other, Robin Hood's Ball in particular sitting in a large island of invisibility as viewed from Lark Hill. Particularly interesting are the sites of the Larkhill Camp (DUR24) and Knighton (FIG27) long barrows ( Figure 6). As noted, both long barrows sit on islands of visibility from Lark Hill but, remarkably, both are at the very limits of visibility from Robin Hoods Ball also, on the far horizon for each causewayed enclosure. Indeed, the viewsheds suggest that that, for both barrows, one side was visible from one enclosure and the other side visible from the other, with the top of both barrows visible from both: they seem to lie literally on the join between the viewsheds. The arrangement of the excavated ditch segments suggests an entrance through the ditch (and presumably the vanished bank). An unusually wide causeway occupied centrally by a large shallow pit separates the south-easternmost pair of excavated ditch segments. The terminal of the south-easternmost ditch at the entrance flares outward from the interior, an arrangement echoed much later at Durrington Walls where 'a curious arrangement of ditches [at the entrance], with the righthand ditch terminal (when exiting the monument) slightly curved outwards' was noted (Parker Pearson et al. 2004, 48). The whole arrangement suggests an entrance overlooking the dry valley, giving the enclosure as a whole a north-eastward aspect.
Five large features of differing sizes and spacing but between 18 and 24m in diameter were located along the south-east-facing slope of the dry valley ( Figure 2). Excavation demonstrated some of these to be solution hollows, part of a broader system of similar features, while geophysical survey detected a sixth comparable anomaly continuing the line to the east (Schmidt and Crabb 2017). Wessex Archaeology had previously investigated two further solution hollows approximately 600m further to the east at the former MoD Headquarters in Durrington (Thompson and Powell 2018)).
These natural hollows have recently been reinterpreted as part of a massive pit structure surrounding Durrington Walls (Gaffney et al. 2020), and while the pattern of features is plausible, the examples encountered at Lark Hill and MoD Durrington that were tested by excavation were undoubtedly geological in origin. While this need not be an obstacle to the existence of the 'massive pit structure', it does suggest a rather different form, meaning and chronology to that suggested by Gaffney et al. (2020).
Given that at least some of the five large hollows encountered at Lark Hill are geological, they would have been visible in the landscape at the beginning of the Early Neolithic. That they were, and that they were significant in the siting of the causewayed enclosure, is demonstrated by the fact that the large shallow pit in the enclosure's entrance lies on their line, and may have been an attempt to incorporate them into the enclosure's architecture. The pit in the enclosure's entrance contained Early Neolithic pottery and struck flint; the excavated parts of the solution hollows did not contain contemporary material, although engineering constraints limited investigation of the examples within the footprint of the Army Basing Programme developments to a maximum depth of 2m.
Two points are of significance. First, the situation of the Lark Hill enclosure at the head of a dry valley leading to the first of the large meanders in the Avon is mimicked in the Late Neolithic by the siting of Durrington Walls. This very large henge was constructed around the head of a short dry valley that continues beyond the enclosure's southeastern entrance to another large meander in the Avon. To a lesser extent the arrangement is later echoed by the Stonehenge Avenue, which leads north-east from Stonehenge on the midsummer sunrise alignment, before turning sharply just south of eastwards and then south-eastwards to the third meander of the river downstream of Larkhill.
The alignment of the Stonehenge Avenue on (and the aspect of the entrance of the earliest phase of Stonehenge towards) the midsummer sunrise highlights the other point of significance of the Lark Hill causewayed enclosure's location. Its aspect northeastward out of the entrance along the line of solution hollows is directly toward the western shoulder of Sidbury Hill, which marks the highest point on the northern horizon, from behind which the sun rises on the midsummer solstice ( Figure 7). This alignment is marked in a much more formal way at the end of the Neolithic period, discussed below. This is the single most important discovery from the Army Basing Programme: the incorporation of natural features marking this solstice alignment into the built architecture of the landscape perhaps 700 years before the building of the first phase of Stonehenge.

Other Early Neolithic evidence on Lark Hill
Other Early Neolithic features on Lark Hill include 26 mostly dispersed pits distributed unevenly across the site ( Figure 2). There is no apparent pattern, and whatever the solution hollows may have come to represent later in the Neolithic in terms of a boundary marker or separator of spaces, they had no such significance in the Early Neolithic, if such can be determined from the distribution and contents of the mostly small pits on either side of them.
Only one pit in the south-eastern part of the site was notable, for both its size and contents. Much larger (over 2.4m in diameter) than the other examples (most no more than 1m in diameter), it contained the fragmented remains of a 14-30 year-old, possibly female. Other human remains were recovered from Early Neolithic contexts (including the causewayed enclosure ditches), but in much smaller quantities.

Early Neolithic evidence at Bulford
Another Early Neolithic inhumation was found at Bulford, a second Army Basing Programme site 3.5km to the east-south-east of Larkhill ( Figure 8). Here, a single inhumation burial was that of a young adult, possibly male, placed on a mound of chalk in a pit and covered with a deposit of animal bones. Deliberate manipulation was visible among features of the burial, including the rectilinear arrangement of the long bones of the lower limbs and many of the bones of the axial skeleton and the smaller bones of the hands and feet to the right of the in situ remains in an apparently random scatter. A sample of the right femur returned a modelled date of 3530-3360 cal BC (86.0%) at 95% probability (SUERC-80712: 4671±25 BP, 3520-3370 cal BC).
The burial sat on the crest of a ridge at the top of a coombe that contained evidence of occupation: a spread of flint-knapping waste (some definitively Early Neolithic) and five pits in two groups containing hazelnut shells, which produced a modelled radiocarbon date of 3390-3180 cal. BC (59.1%) at 95% probability (UBA-36393: 4590±32 BP, 3500-3120 cal. BC). Associated artefacts consisted of flaking debris including microdebitage and retouched tools, Early Neolithic pottery, bone and sarsen fragments. It is possible to interpret the distribution of the groups of pits as marking the location of a structure in the base of the coombe, arranged around a 'house void' (Garrow et al. 2006;Chaffey and Brook 2012). Three more Early Neolithic pits sat on the spur immediately to the west of the coombe, below the burial; two more lay on the high ground to the north-east while a further two lay on the high point to the south-west. All contained Early Neolithic ceramics and struck flint.

☞ The Early Neolithic landscape
How do the causewayed enclosure on Lark Hill and the burial on the hilltop at Bulford fit into the wider pattern of Early Neolithic ceremonial architecture in the area?
The Stonehenge Cursus runs for 2.8km in a broadly west-south-west to east-northeasterly direction, although it is not straight: both ends narrow giving the western end a pronounced westward turn and the eastern end a less pronounced trend to the east where it terminates a little way short of the Amesbury 42 long barrow, which lies transversely to the line of the Cursus. Excavations of the Cursus in 2007 by members of the Stonehenge Riverside Project (Parker Pearson et al. 2007a) recovered antler from the base of the western terminus that gave radiocarbon determinations of 3630-3375 cal BC (OxA-17953: 4716±34 BP) and 3630-3370 cal BC (OxA17954: 4695±34 BP). These dates are definitively Early Neolithic (Thomas et al. 2009) and place the construction of the Cursus centuries before the first phase of Stonehenge (the ditch dating to 2990-2755 cal BC: Marshall et al. 2012).
That the Cursus clearly pre-dates Stonehenge is critical, since the relationship between the two is central to understanding the location and purposes of both, as well as the location of other important places locally. Viewed from the Stonehenge circle, the eastern end of the longest, effectively straight (central) portion of the Cursus is broadly on the alignment of the midsummer sunrise. Similarly, the western end of the long portion (although invisible from within Stonehenge, hidden as it is by the near horizon on which the later Cursus Barrows sit) is broadly on the alignment of the midsummer sunset. This latter alignment is later shared by the Durrington Walls 'Avenue' as it climbs from the Avon meander towards the later henge's south-eastern entrance and the Southern Circle (Parker Pearson 2012, 79-81). The Stonehenge Hidden Landscape Project identified large geophysical anomalies, perhaps pits, within the Cursus at the points where these solstice alignments from Stonehenge intersect with its line (Gaffney et al. 2012). Given the midsummer solstice aspect of the Lark Hill enclosure's entrance a century or more previously it seems unlikely that the general andassuming the geophysical anomalies within the Cursus are contemporary archaeological featuresspecific solstice referents of the Cursus are coincidental. Similar relationships exist; the setting of the midwinter sun between the banks of the Dorset Cursus behind the long barrow on Gussage Cow Down (Barrett et al. 1991, 50, fig. 2.16), for instance. For this to hold at Stonehenge of course requires that there was something at Stonehenge half a century prior to its earliest phase as currently understood.
Perhaps there was. Pitts has suggested that the Stonehenge ditch may have incorporated earlier features (Pitts 2012). Some combination of features hinted at by the 'North Barrow' and the low mound identified by Bowden et al. (2015, 28-32) may have marked the spot. Perhaps it was the Altar Stone, shaped at one end and probably once a standing stone. The centre of the circle has been very much disturbed over the centuries: the Duke of Buckingham caused it 'to be digged' in the 17th century (Walker 1995, 9); a century later, William Stukeley had a hole dug against the Altar Stone (Burl 2006, 45). William Cunnington excavated in front of the Altar Stone at the start of the 19th century (possibly destroying a prehistoric feature in the process: Parker Pearson 2012, 32), while Captain Beamish returned to the spot around 1839 (Walker 1995, 9). Traces of a post or other marker having stood in this location are unlikely to have survived these early attentions. Parker Pearson et al. (2007b, 623-6) have suggested that a large pit dug in 2450-2210 cal. BC may have removed a large (perhaps natural) stone from the circle's centre.
What of the Cursus itself? Its line is not straight. As Thomas et al. noted, the first 600m of the southern ditch at the western end align on Beacon Hill. Further to the east the line is toward the Amesbury 42 barrow on King Barrow Ridge (Thomas et al. 2009, 51), although the apparent contemporaneity of the two means that it is unlikely that Amesbury 42 was the cursus's target. The dominant line of the Cursus continues beyond its eastern terminal through the Cuckoo Stone and Woodhenge, both associated with Early Neolithic activity in the form of pits or tree hollows containing cultural material (Thomas et al. 2009, 42;Parker Pearson et al. 2020, 136ff). The line then cuts across the meander in the Avon later connected to Durrington Walls, to climb the flat hilltop at Bulford occupied by the manipulated Early Neolithic inhumation burial described above ( Figure 9). Westward, the line intersects with the long barrow on Winterbourne Stoke Down (WIN53) (Exon et al. 2000).
It is clear, then, that the line occupied in part by the Stonehenge Cursus was of some significance, both in the Early Neolithic and later. Why, then, was some part of it given physical expression by the banks and ditches of the Cursus itself, while other parts were referenced by the siting of other features? It can only be that the Cursus marks the part of this line between midsummer sunset at the western end, and midsummer sunrise at the eastern. In effect, the Cursus marks the part of the sky in which the sun never appears and, perhaps more speculatively, its path beneath the ground on the shortest nights of the year when viewed from what became Stonehenge.
Here then is proof-positive that the Cursus is a path, but not necessarily (or not only) one trodden by human feet. It marks the descent of the sun below ground, its passage under the earth, and its eventual re-emergence into the world. Here is our first pointer towards the answer to Richard Atkinson's 'we do not know' questions: the questions about Stonehenge beginning with 'why?' (Atkinson 1979, 178). A less convincing case for cosmological integration can be made for the Lesser Cursus, dated on the basis of antler picks in the phase 1 and phase 2 ditches to 3496-3042 cal BC (OxA-1404: 4550±120 BP) and 3606-3200 cal. BC (OxA-1405: 4640±100 BP). The location of this structure takes advantage of 'the summit of a remarkably flat ridge top' (Richards 1990, 72), and the coincidence of its extrapolated line in its east-north-easterly direction is revealing. Some 3.8km from the cursus's western terminus, the line reaches the dry valley leading to the meander in the Avon, above which sits the causewayed enclosure on Lark Hill ( Figure 9). Exon et al. suggested that the Lesser Cursus may have been constructed with reference to the line between the long barrow on Winterbourne Stoke Down (their number 14, which sits on the path of the Stonehenge Cursus) and Knighton Down (their number 29), 1.6km west of the Lark Hill enclosure (2000,44). The trend is general rather than specific, and the dry valley down from Lark Hill to the Avon is a more exact match (there is no way the authors of that study could have recognised the significance of the spot, of course, as the causewayed enclosure was invisible to every non-invasive technique).
What does not fit into this pattern are the region's other causewayed enclosure at Robin Hood's Ball, the pits and artefact scatter outside it and elsewhere in the area, and the various long barrows. Of the latter, Exon et al. noted the way various groups are arranged around the heads of dry valleys (2000,39) while David Field noted a similar phenomenon among groups of barrows on the Salisbury Plain Training Area (McOmish et al. 2002, 23-7). Additions and subtractions from the long barrow corpus only seem to strengthen the association (Roberts et al. 2018). The causewayed enclosure at Robin Hood's Ball stands out as the lone example of a major Early Neolithic earthwork not tied to the system of (perhaps seasonally wet) dry valleys, and it contrasts with Lark Hill in other ways. Lark Hill commands views along the valleys of the Avon and Wylye to the north, south and west, but has no view of much of the downland between the Lesser Cursus and Robin Hood's Ball. The latter site has a viewshed dominated by areas to its south and west, as well as south of Amesbury and Bulford Camp on the eastern horizon (Exon et al. 2000, 32-4). The pits contained animal bone, pottery, flint-knapping debris, retouched tools and charcoal in varying quantities, dog coprolites and a number of flint spheres (generally unused but found in larger numbers than might be expected). A range of other objects including carved chalk, flint and stone axes or fragments, a discoidal knife, antlers and aurochs bones, the talons of a sea eagle, and beads were also present. The assemblages suggest a range of domestic, ceremonial and feasting activities. In some instances the quantity and range of special objects seems disproportionately large compared to those of more conventional artefact types, and some of the pits (or pairs of pits) incorporated elements of structured deposition.
Thirty-eight of these pits contained over 1300 sherds of Woodlands Grooved Ware. Radiocarbon dates obtained from animal bone and charred hazelnut shells in the same features have provided modelled dates centred on 2950 cal BC, indicating that the Woodlands Grooved Ware from Bulford is almost as early (if not as early) as that from Orcadian sites claimed to be the style's place of origin. Modelling of Orcadian radiocarbon determinations has suggested that the Grooved Ware assemblage from Barnhouse dates to between 3160 and 3090 cal BC and 2890-2845 cal BC; that from Sanday to between 3210-2935 cal BC and 2815-2650 cal BC; and at the Stones of Stenness the sequence starts at 3020-2890 cal BC .
Such apparent contemporaneity poses several questions about contact between Wessex and Orkney around 3000 BC, but it is significant in a second way, as being exactly contemporary with the construction of Phase 1 of Stonehenge. The phase 1 Stonehenge ditch is dated to 2990-2755 cal BC , while Aubrey Hole 32 dates to 3000-2890 cal. BC (Parker Pearson et al. 2008, 18). It seems inconceivable that the community undertaking whatever activities resulted in the Bulford pits did not know about Stonehenge, and it is at least possible, and even probable, that the builders of Stonehenge and the Bulford people were the same. If this is the case, and if the Aubrey Holes were the earliest phase of Stonehenge, and if it is true that they mark the location of a bluestone circle (Parker Pearson et al. 2020, 164-8), what made users of 'Orcadian' pottery bring stones from Wales to this spot in southern England? The spot on which Stonehenge was built was already special, and its renown (made so evident later in its life by stable isotope analysis) may have been widespread, even at the start of the third millennium.
4. In the Lifetime of the Stones -the End of the Late Neolithic and Beakers (27th to 21st Centuries BC)

The Bulford henges
There are no dates for the erection of the Bulford Tor Stone, 0.4km south of the hilltop. The existence of modified natural sarsen boulders variously adjacent to the later henges at Stonehenge, Woodhenge and Bulford -the Tor Stone and Cuckoo Stone are approximately the same distance from their henges; the Heel Stone very much closeris unlikely to be coincidental.
On the hilltop at Bulford, by this time a location of great traditional significance over perhaps a millennium, two small henges were situated immediately adjacent to each other, both approximately 20m in external diameter and each with a single entrance on the northern side, constructed as a series of conjoined gang-dug segments, separated by low causeways (Figure 11). No internal features survived in either and although evidence is not conclusive, the ditch fills suggest that the western henge had an internal bank, while the eastern could have had a bank outside its ditch. Figure 11: The Bulford henges Excavation was limited since both have been preserved and scheduled and excavation was only undertaken to inform the scheduling process. Artefacts were consequently scarce, but the eastern henge is dated by a pig humerus from secondary silts modelled as 3100-2920 cal BC (SUERC-78117: 4394±29 BP, 3090-2920 cal BC) and hazelnut shell modelled as 2910-2630 cal BC (UBA-36926: 4208±46 BP, 2910-2640 cal BC). Primary deposits in other ditch segments, however, contained sherds of undecorated Grooved Ware and charcoal that returned a date modelled as 2880-2580 cal BC (UBA-36925: 4130±32 BP, 2870-2580 cal BC). That these potentially early dates are not entirely erroneous is suggested by other finds from the ditches including a chisel arrowhead, although a dog skull from the same layer at the base of the secondary fills was modelled as 2500-2350 cal BC (SUERC-78111: 3948±29 BP, 2570-2350 cal BC). Similar small henges exist elsewhere around Stonehenge. The (perhaps somewhat later) West Amesbury henge on the banks of the Avon at the end of the Stonehenge Avenue is approximately 20m in diameter (Parker Pearson 2012), while the 'pit circle' beneath Amesbury 6 (240m west-south-west of Stonehenge) appears to be very similar in terms of size, configuration, and later alteration (Field et al. 2014, 13, fig. 10).

Other Late Neolithic activity at Bulford
Contemporary activity on the hilltop includes a group of six pits above the coombe, east of the henges. Two fragments of a snapped but conjoining red deer tine, which produced a radiocarbon date modelled as 2570-2450 cal BC (SUERC-77444: 3971±25 BP, 2570-2410 cal BC), had been placed side by side at the base of one pit, directly opposite a large unworked flint nodule. Another pit in the group contained an apparently unused antler from which only the crown had been removed, along with two scrapers that were similarly placed together. This antler produced a radiocarbon date modelled as 2480-2370 cal BC (SUERC-77446: 3904±24 BP, 2470-2300 cal BC).
Two large circular features lay at the northern limits of the site. One, over 4.50m in diameter, had a spread of material including animal bones, burnt flint and flint knapping debris (with microdebitage and refitting artefacts) across its base. The flaking debris was concentrated in the south-east quadrant where it may have resulted from controlled dumping or alternatively from in situ knapping. A pig mandible returned a date modelled as 2570-2450 cal BC (SUERC 77452: 3964±25 BP, 2570-2350 cal BC). The second feature was located approximately 64m to the east of the first and was almost totally devoid of finds.
A post-pit was located a short way from this empty pit. It measured approximately 1.30m in diameter and was 0.83m deep, with a central post-pipe approximately 0.70m across. Charcoal fragments from towards the base of the feature associated with fragments of burnt human and animal bone returned a radiocarbon date modelled as 2480-2370 cal BC (UBA-36394: 3875±30 BP, 2470-2220 cal BC). The edges of the post-pit were lined with residual chalk rubble packing, well preserved on the north side but splayed outwards on the south, suggesting that the post may have been pulled out.

Late Neolithic activity on Lark Hill
At Larkhill, two ring ditches sat on the slopes above the coombe's eastern side ( Figure  12). One, situated on the hilltop, consisted of a circular ditch with an average diameter of 11.50m (10.60m internally and 13.20m externally). The ring ditch was probably not a ploughed-down or otherwise levelled bowl or bell barrow, as there were no indications of differential fills in the ditch to suggest either a large internal mound, an internal or external bank, or any combination of these. Small assemblages of struck and burnt flint and animal bone were recovered from the ditch, along with thirteen sherds of Early Neolithic pottery. These sherds seem entirely out of keeping with the ring ditch, and perhaps derive from an earlier feature on the hilltop, destroyed by the ring ditch.
A large irregular tree-throw hole was located in the ring ditch's interior. Other than nine pieces of struck flint and eight burnt flints, it was empty and had no stratigraphic relationship with any dateable features. It is possible that the ditch was constructed around a tree that stood in this spot.
A second ring ditch was approximately 50m downslope to the south-west. It consisted of a circular ditch with an average diameter ofagain -11.50m (10.60m internally and 13.20m externally). Again, the ring ditch should probably not be considered a plougheddown or otherwise levelled round barrow as there were no indications of any mound or bank or mortuary activity at this stage. It must, however, be noted that there had been extensive truncation of the site in antiquity, with up to 0.50m of the upper portion of the ring ditch removed (D. Norcott pers. comm.).
A large quantity of material included over 1100 pieces of struck flint and more than 1500 burnt flints, dominating an assemblage that also contained fragments of animal bone and sherds of pottery, unevenly distributed around the circuit. Of the total pottery assemblage 43 sherds were positively assigned to the Late Neolithic while 11 had a broader Late Neolithic/Early Bronze Age date.
Interior features dated to the Early Bronze Age, and both ring ditches were encircled by posts, probably at this same time (below). Some Early Bronze Age features cut one of the two tree-throw holes in the area defined by the second ring ditch, adding credence to the suggestion that both were constructed around standing trees. Two isolated pits on the western side of the site date to this period based on their contents. One had a relatively large assemblage of material including struck flint, nearly 800 fragments of animal bone, 52 sherds of pottery (mostly Durrington Walls style Grooved Ware) and a little burnt flint. Its primary fill suggested that it had been left open to the elements long enough for weathering to take place before it was backfilled. The second pit, a little way to the north, contained an exceptional assemblage of 439 sherds of pottery (mostly Durrington Walls style Grooved Ware) and a large quantity of burnt flint (there was no record of other burnt material or ashy inclusions). It had been backfilled through episodes of deliberate deposition; no primary fill was identified.

Solution hollows and post alignments
Unlike the ring ditches, both of these pits lie outside the curving line of solution hollows forming the north-western arc of the 'massive pit structure' (Gaffney et al. 2020). The line of these solution hollows was marked at this same time by a row of 17 pits and posts (in three groups separated by unexcavated areas) standing inside the arc, running on a broadly east-north-east to west-south-west direction for some 260m (exiting the excavated area at both ends). Two sorts of feature are represented: smaller examples, typically less than 0.5m in plan and shallow (surviving to under 0.25m deep) and larger features 0.8-1.4m in plan and 0.85-1.25m deep, some with larger lips interpreted as ramps for inserting posts. None of the shallower features showed any indication that they had held a post and were usually devoid of finds. The larger examples tended to have clear post-pipes and produced moderate to large assemblages of typically worked and burnt flint. Very little other material was recovered (a small quantity of apparently Late Neolithic pottery came from one of the postholes).

☞ Solution hollows and post alignments at Durrington
The post rows at Lark Hill are undated, but they appear to be a continuation of a row of 16 very similar features forming an alignment over 240m, identified in previous excavations at the former MoD Headquarters, Durrington (Thompson and Powell 2018)). There, a second line of seven postholes intersected at a tangent, running south for 40m to the edge of excavation. From the two intersecting alignments, one of the postholes contained the charred remains of a post, some contained sapwood charcoal, and animal bone was recovered from others. Six contained Grooved Ware.
Modelling of the radiocarbon dates suggests that the rowsor parts of themwere constructed between 2745-2580 cal BC (85.9%) at 95% probability. Dates from animal bone in higher fills date the removal or rotting of the posts to before 2575-2470 cal BC (at 95% probability) (Thompson and Powell 2018), 108). A cremation burial in a shallow hollow was modelled as 2585-2460 cal BC (SUERC-49176: 4000±34 BP), contemporary with the infilling of the voids of the dismantled post alignment, and perhaps commemorating it.
This cremation burial is interesting for another reason. It lay in a shallow oval hollow on the line of the much larger solution features, covered with a deposit of over 2600 pieces of flint-knapping waste. The fills above contained more than 2700 pieces of struck flint. Although clearly anthropogenic, the pit seems to be located deliberately between two solution hollows, very much in the same way as the shallow oval pit in the entrance to the Lark Hill enclosure lies on the solution hollow line. At MoD Durrington, at least some of the solution hollows were the focus of contemporary deposition: in the western-most a flint gravel surface, possibly naturally accumulated around its outer edge, provided a platform on which knapping took place, predominantly on the feature's eastern side. Over 800 pieces were recovered, mostly unretouched debitage, in markedly better condition than the material filling the central and higher silting deposits.

The Lark Hill post alignments
A second row of six postholes at Lark Hill running south-west to north-east for over 30m intersected with the north-western terminal of the south-eastern ditch segment of the causewayed enclosure, on the eastern side of its entrance. These features were mostly larger (only one less than 0.5m diameter). One had a possible insertion ramp on its southern side.
It is assumed that these features held timber posts, with excavated chalk being used as packing material. Similar deposits of chalk were observed within the features, indicative of posts being removed and packing material slumping towards the base of the features creating near-horizontal deposits. No evidence of post-pipes was observed, suggesting withdrawal of posts rather than decay in situ; the upper fills appeared as a mix of topsoil and feature edge material.
Dates for this part of the row's construction are not available, but a fragment of a cattle atlas vertebra from one of the features gave a date of 2470-2300 BC (SUERC-70508, 3911±29 BP). This provides a terminus ante quem for the post removal, perhaps placing the activity somewhat later than at MoD Durrington.
A further row of six postholes lie to the north-east, immediately north-east of a similarlyaligned Middle Bronze Age enclosure, with which it is possible they are associated. They lie, however, on the extrapolated line between the group cutting the causewayed enclosure ditch and the alignment to the north. All are small, approximately 0.5m in diameter.
There is no indication at Lark Hill that these three separate groups of posts were ever connected: even taking into account the effects of truncation, nowhere among the various features revealed in the very large excavated area are there convincing candidates for further individual or grouped postholes that could belong to the same structure. It seems most likely, then, that the groups of posts were related, but discontinuous, running for various shorter or longer distances along parts of the interior of the arc formed by the solution hollows.
If these posts, together with those identified further to the south by Gaffney et al. (2020), all belong to a single discontinuous gigantic structure then they are of considerable interest. The only available date for the construction of such a truly monumental undertaking comes from MoD Durrington, at 2745-2580 cal BC. Why then does the arc they form appear to be centred on Durrington Walls? Even at the very youngest end of the distribution the posts pre-date the 'village' phase of activity there by some decades. The dates from MoD Durrington for the posts' removal, however, coincides rather comfortably with both the henges on the Bulford hilltop and either the 'village', the timber circle preceding the henge bank, or the Durrington Walls henge itself. It is tempting to suggest that the removed posts were recycled to Durrington Walls where they stood for no very great period before being taken down again as the henge was constructed.
Whatever the relationship between Durrington Walls and the post lines, it seems that the posts were decommissioned over a prolonged period, and in a variety of ways, with some extracted, others burnt and some left to rot.
One possible explanation for this is offered by the siting of the six posts cutting the causewayed enclosure's entrance. The row curves slightly, but measurements of azimuths of the group and various elements within it have demonstrated that the northeasternmost three posts have an end-to-end azimuth of 49.8° and a best-fit azimuth for all three posts of 49.6°, close enough to the direction of the midsummer solstice sunrise over the shoulder of Sidbury Hill (between 49.1° for the first gleam (upper limb) and 49.7° for the centre) to show that the alignment is meaningful (Leivers et al. 2021). Assuming that the still-visible ditches defining the causewayed enclosure's entrance were not coincidentally chosen for the location of the post row, then the restatement of the (by now very old) solstitial alignment on Lark Hill may have meant that the posts survived here longer than in other parts of the structure.

Beaker inhumations and other features
The continued significance of this part of the post structure may be inferred from the presence at Larkhill of four graves (none yet dated by radiocarbon), two within and two beyond the solution hollow arc and post alignments.
Outside the circles, one grave contained what was believed to be an inhumation burial. Only seven teeth were recovered, from an infant of about one year of age accompanied by a Mid-Carinated Beaker. The second burial had suffered significant plough damage and was heavily disturbed, but the remains appeared to be of a possible female, 14-25 years old, accompanied by a Low-Carinated Beaker, smashed by the plough.
Those inside the ring were more remarkable. One was cut into the fill of a tree hollow with the skeleton positioned in the western half of the grave. The burial was of an adult male aged 35-55 years, in a flexed position. A grog-tempered Beaker was situated at the spine.
The second example inside the rings contained the skeletons of three children ( Figure  13). The earliest, badly crushed, burial was of a 10-12 year old, aligned roughly eastwest lying on their right-hand side and very tightly crouched with the arms and legs pulled in to the body and the hands and knees up to the face. At the back of the head was a Plain Beaker. Figure 13: The triple Beaker burial at Lark Hill Partially overlying this skeleton was a 9-11 year old, aligned roughly east-west, again tightly crouched on their right-hand side with the arms and legs pulled in and the hands up by the face. Overlying both were the heavily crushed remains of a 3-4 year old. The bones were very fragmentary, so position was difficult to interpret although it appears the individual was lying prone. It is unclear if the three individuals had been buried at the same time or if there was a hiatus between each burial. The apparent differences in burial inside and outside the sinkhole arc and post alignments are, however, dispelled by Beaker inhumations within Larkhill Camp to the west, close to the Knighton long barrow. Here, two Beaker inhumations included a crouched 14-16 year old female, radiocarbon dated to between 2340 and 2140 BC and a pit containing the disarticulated (but in some semblance of anatomical order) remains of a 7-8 year old, the most notable feature of which was evidence for a small, wellhealed trephination in the centre of the frontal bone close to the coronal suture. The rarity of examples of this form of surgical procedure from the Bronze Age is enhanced in this instance by its having been performed (successfully) on a juvenilethis is perhaps a unique occurrence, since previously recorded Bronze Age examples, several from Wiltshire, are all on adults. Fragments of Beaker pottery along with worked flint, burnt flint, burnt animal bone, fragments of sarsen stone and a pierced stone bead were recovered from the backfill of the pit containing these bones.
Eleven pits at Lark Hill (one probably associated with four postholes) also dated to the Beaker period. All lay within the arcs of solution hollows and posts, with the exception of one, dated to this period based only on two fragments of Beaker. None is very securely dated, with the exception of one (associated with the postholes) containing 19 sherds of Beaker ceramics. Four other essentially undated pits cluster around it. A second small group of pits with little in the way of contents clustered around an example containing a modest assemblage including a flint knife and 22 sherds of Beaker pottery.
A large oval pit measuring 1.52m deep lay at the western limits of excavation. Given its size, the assemblage recovered from it is modest. The one large pottery sherd from its fills was given a Late Neolithic/Early Bronze Age provenance while a red deer antler was radiocarbon dated to 2200-1950 BC (SUERC-79429, 3678±40 BP). The stratigraphy with a primary deposit followed by a period of deliberate backfill shows that the pit was left open after its initial cutting before material was deliberately deposited in it. It was not completely backfilled, and it was left to silt up naturally.

Beaker-period activity at Bulford
At Bulford, evidence of activity in the Beaker period was limited, but unmistakeable. A sub-oval pit was filled with a band of compacted chalk rubble concentrated along the south side, thinning to the west and east. The central area, approximately 0.50m square, was filled with chalk rubble mixed with brown silty loam that had collapsed through the lid of a box-like container into the original empty space in which had been placed a Beaker pot and a stone archer's wrist guard (Figure 14).

The Early Bronze Age at Bulford
Continuous ring ditches encircled the two Late Neolithic henges at Bulford, enlarging the diameters to 27m on the west and 30m on the east (Figure 15). The two ditches intersect, but it was not possible to demonstrate priority in the excavated portion. The western example appears to have had a low internal bank or mound; on the east evidence was lacking. No burials or other internal features were found. The eastern ditch was dated by a fragment of red deer skull from a fine silt on the base to 1950-1760 cal BC (SUERC-78112: 3534±29 BP).

Figure 15: The Bulford Ring Ditches
Parallels for such conjoined ditches exist around Stonehenge: Amesbury 46 and 47 in the Cursus group, for instance (Bowden et al. 2015, 60). At Bulford these siteswhatever their form may have beensit in a much-inhabited area along the Nine Mile River, which contains one of the densest distributions of round barrows in the country, such that McOmish et al. have suggested that 'it would be plausible to see the Nine Mile River valley, itself, as a sacred entity' (2002, 50).

Early Bronze Age Lark Hill
At Lark Hill (Figure 16), on the hilltop above the dry valley's eastern flank, a ring of 14 oval or sub-circular postholes surrounded the Late Neolithic ring ditch, approximately 0.50m from its outer edge, between 0.45m and 1.60m apart. None produced dating evidence: the circle is provisionally dated to the Early Bronze Age owing to its similarities with a second post circle to the south-west.

Figure 16: Larkhill Early Bronze Age
This second example consisted of 11 postholes, again surrounding a Late Neolithic ring ditch. Three of the postholes cut the ring ditch's upper fills, and it is probableconsidering the degree of truncation and the proximity of the postholes to the ditch -that several others originally cut the fills of the ditch.
Within the post circle were four features, three cutting a tree-throw hole. One (an unurned cremation deposit) contained burnt flints, two fragments of Bronze Age pottery, a fragment of stone and a metal bead and the remains of a 15-17 year old female accompanied by the cremated remains of a possible small canid. A fragment of human femur was radiocarbon dated and produced a date of 1740-1540 cal BC (SUERC-81889, 3354±28 BP) placing it at the very end of the Early Bronze Age. A second feature may also have been an unurned cremation grave, containing four fragments of cremated human bone from a sub-adult/adult.
A third feature was a small, shallow pit containing a fragmented near-complete Food Vessel. No human remains were recovered to indicate that it had been a grave, but the condition of the pot showed that there had been truncation of the feature. Nearby was another small shallow feature whose function was unclear. The fill of the tree-throw cut by these features contained burnt flint.
In plan, this pair of sites appear very similar to Amesbury 135 (Gaffney et al. 2018), both in size and morphology, with an inner ring ditch and outer post circle. Other examples are scarce, but the likelihood of multi-phase construction should be borne in mind, as should the possibility that these sites need never have been (or may not originally have been) barrows.
On the opposite side of the dry valley, a large sub circular posthole 2.20m long by over 1.20m wide and 1.67m deep was located on the south-facing slope (Figure 17). The shallower concave eastern edge is interpreted as an insertion ramp for the erection of a large timber post. Its southern side had been destroyed by a World War 1 training trench. The disturbed chalk packing material lay below a weathering cone into which a collection of disarticulated animal bone and human remains were placed. The human remains included articulated and disarticulated bone, some of which exhibited cut marks, canid gnawing, and polishing, suggesting earlier exposure and manipulation elsewhere. At least three individuals were represented: an adult male 35-50 years of age; an adult female 18-25 years of age; and a possible female adult 25-35 years of age.
A sheep/goat left pelvis from one collection of animal bone was radiocarbon dated to 1880-1630 cal BC (SUERC-79428: 3428±39 BP). There is no convincing evidence to suggest how much time elapsed between the erection of the original post and the deposition of the human and animal remains.
A tree hollow downslope from the causewayed enclosure contained a small quantity of struck flint and animal bone and the fragmentary remains of a Collared Urn. All of the artefacts were restricted to the upper fill. A second Collared Urn was placed in the northwesternmost segment of the partially filled causewayed enclosure ditch. 6. Discussion

Towards a sequence of activity in the Early Neolithic
The results of the Army Basing Programme allow the construction of a chronology of activity in the Stonehenge landscape that is both longer and somewhat different in tone to existing schemes. In summary (and putting aside the growing evidence of Mesolithic activity around the Avon, if not on the chalk, given the chronological gap between the two bodies of evidence), the sequence begins with: • the Coneybury Anomaly, still probably the earliest dated evidence in the 38th century, but perhaps now only slightly earlier than or even contemporary with • the Lark Hill causewayed enclosure, which could be as early as the first half of the 38th century, or as late at the middle of the 37th, • followed by Robin Hood's Ball, and some of the dated long barrows seeming to fall into the 37th and 36th centuries, with both cursuses and more long barrows shortly thereafter along with (possibly) the Wilsford Shaft.
It is worth bearing in mind the limitations of the radiocarbon dates for the Early Neolithic. Few of the long barrows are directly dated; Robin Hood's Ball has very few dates, Lark Hill currently only a single determination. Many of the sites in question show evidence for alteration and re-use, sometimes for many centuries after their foundation. How the evidence of the various artefact scatters and pit groups fits into this chronology is somewhat opaque.

The Middle Neolithic
What is clear is the lacuna in construction during and after the 34th century, for at least 300 years. Given that the first phase of Stonehenge is contemporary with the first use of Grooved Ware ceramics, and consequently Late Neolithic, a Middle Neolithic phase of earth, stone and timber architecture typified by Peterborough Ware iswith the possible exception of the Normanton Down long mortuary enclosure -conspicuously absent.
The Middle Neolithic was, until recently, rare in the Stonehenge landscape: a pit group north of the Avenue, individual dispersed pits, small quantities of Peterborough Ware in artefact scatters, and some chisel arrowheads (and even these need not be Middle Neolithic, given the associations with Woodlands Grooved Ware). The radiocarbon date from pits in the coombe at Bulford appears to be Middle Neolithic, although the pottery consists of bowl forms (and not Ebbsfleet bowls). More recently, two sites have gone a good way towards clarifying the nature of Middle Neolithic inhabitation: at West Amesbury Farm and on the Army Basing Programme at Larkhill Camp. Both contained pit clusters of Middle Neolithic date.
At Larkhill, there is a clear shift in the preferred locations of activity in the Middle Neolithic ( Figure 18). The area occupied by the causewayed enclosure and its immediate hinterland to the north and east were devoid of evidence of Middle Neolithic occupation, although there is no sense in which Early Neolithic sites were deliberately avoided: further to the west, higher up the slope in the area now occupied by Larkhill Camp, between the enclosure and the two Knighton barrows, there is good evidence for Middle Neolithic occupation.

Figure 18: Middle Neolithic evidence at Larkhill Camp
In one area, between 200 and 400m east of the Knighton long barrow, 16 pits in widely spaced pairs or small groups were of Middle Neolithic date. Twelve of these contained Peterborough Ware pottery of the Ebbsfleet, Mortlake and Fengate types. In a second area, no more than 500m west of the projected line of the causewayed enclosure, two pits contained Peterborough Ware pottery. One, 7m to the south of a cluster of 12 pits, contained sherds of Mortlake type while a second pit in the cluster, which spread over a north-east to south-west aligned area 8m long and 3m wide, contained fragments of a single Ebbsfleet vessel. The pits varied in size and shape, most of them circular or subcircular, and all contained chalk-rich fills, with the evidence suggesting they had been rapidly backfilled.
At West Amesbury, Historic England encountered five Middle Neolithic pits and a burial, along with four postholes that may have been contemporary. Ceramic associations were predominantly of Fengate type, although some Mortlake was present. An astonishingly large flint assemblage (over eleven thousand pieces from the pits) included burins and 'mini rods' (Roberts et al. 2020), both more usually encountered in Mesolithic assemblages (although definitely Middle Neolithic here and elsewhere in the region All of this activity could easily have taken place at much the same time. What this would mean is that users of Orcadian Woodlands Grooved Ware were erecting a stone circle made of rocks quarried in south Wales on a spot on Salisbury Plain.

Why Stonehenge is where it is
We come once again to the perennial questions of what and why? What is Stonehenge, and why is it where it is? The circle's location has often been considered 'undistinguished' (Cleal and Allen 1995, 37), and as Cleal and Allen note (1995, 40), intervisibility between the stones and the cursus does not seem to have been important in the siting of either. But, as we have seen, the relationship between the two clearly was of considerable importance, both in terms of their location and their meaning; so important, in fact, that direct visibility of the point where the sun sets into the cursus on midsummer was less important than Stonehenge being where it is. So why this particular spot?
The often-noted claim that there is nothing to distinguish that particular patch of downland from any other, and that it carries no particular topographic qualities (see, for instance,  for a discussion of views into and out of the circle) now needs revision, given the Stonehenge Riverside Project's discovery of geomorphological features underlying the Avenue (Allen et al. 2016), and while these low chalk ridges and periglacial stripes may have influenced Stonehenge's situation, they need not have determined it, especially given that the orientation of the first Stonehenge on the summer solstice is an approximate aspect rather than an exact orientation (if it even exists at all: Ruggles 1997). The GPR plot in Field et al. 2014 (9, fig. 7) implies that Stonehenge may sit on top of, rather than at the end of buried features trending broadly south-west/north-east. Nevertheless, the periglacial stripes and chalk ridges are intriguing, not least because they suggest another parallel between the locations of Stonehenge and the Lark Hill enclosure on linear arrangements of geological features with solstitial references. Newell's Mound provides another possible referent for Stonehenge's solstice aspect, and the trend of both the circle's original aspect and its altered precise alignment towards the midsummer sun's rising over Sidbury Hill, or rather what it coincides with along its way, provides one further possible clue to the reason for Stonehenge's location.
The Stonehenge Riverside Project's investigations along the solstice line on the top of Lark Hill revealed nothing convincing among the disturbances caused by the early 20thcentury military camp (Parker Pearson et al. 2005). Further to the north-east, a group of round barrows straddle the line, visible on aerial photographs and enclosed by a trapezoidal ditch (Figure 19), one recently tested during a watching brief on a water pipeline (Randall 2020). These are all almost certainly later than the establishment of the line from the Stonehenge circle at the start of the third millennium (leaving aside the possibility of an earlier marker within what became Stonehenge): the enclosure is undated and could be early, but it appears to run up to at least one of the barrows, suggesting an Early Bronze Age date at the very earliest. Figure 19: The summer sunrise alignment from Stonehenge along its avenue, over Lark Hill, to the bend in the Avon, showing Stonehenge, the Neolithic and Bronze Age evidence at Larkhill Further to the north-east, the line cuts through the sinkhole arc tantalisingly close to feature 14D (Gaffney et al. 2020) the feature at MoD Durrington with the flint 'metalling' and Late Neolithic knapping debris (Thompson and Powell 2018)). From here, it continues to bisect the large meander in the Avon from which the dry valley leads up to the Lark Hill causewayed enclosure. Darvill noted the significance of precisely this point on the Avon in his discussion of Stonehenge's 'sacred geography' (Darvill 1997, 179 and fig. 5). Could it be that the meander in the river maintained its significance over 700 years to such a degree that it influenced the location of Stonehenge?

Objections to the model
There is a venerable tradition of drawing lines on maps of the Stonehenge landscape and claiming all sorts of things on their basis. We need to apply a good degree of scepticism to any such scheme, including this one. The most obvious objection to the suggestions made here are that key elements are not intervisibleneither the bend in the Avon north-east of Lark Hill nor Sidbury Hill can be seen from Stonehenge and, conversely, Stonehenge cannot be seen from the bend in the Avon: the rising ground leading up to the Lark Hill ridge obscures the view. But this might perhaps be no objection at all: as suggested for the physically much closer relationship between the site of Stonehenge and the western end of the Stonehenge Cursus, the knowledge that these things were there, and important, could very easily have outweighed the need to be able to see one from the other. As Roberts et al. note, it is important to consider 'the affordances for visibility that may have arisen through movement around the landscape in the course of day-to-day activities, particularly following watercourses with livestock' (2020).
Are the difficulties of maintaining a line between invisible points over such a distance impossible? From the centre of Stonehenge to the Durrington Meander is 4.3km, but a series of markers (periglacial stripes, Newell's Mound, the large pit in the Cursus, etc.) could carry the line in a series of steps over intervening horizons.
That Stonehenge would have to have been quite a distance from its location for the solstice alignment to not cross the meander in the Avon is not necessarily an objection. We can distinguish between general solstitial aspects in the Early Neolithic and precise solstitial alignments only occurring later, at the end of the Late Neolithic, in the Stonehenge landscape at least, even if it is not the case elsewhere: the summer solstice sunrise alignment built into the Early Neolithic trapezoidal enclosure at Rectory Farm, Godmanchester, for instance, is 'impressive in its precision' (Ruggles 2019, 77). It seems more likely that a combination of features, mostly natural, some artificial, combined to place Stonehenge where it is, in a landscape already rich with meaning.

Activity beyond Stonehenge
Events in the four centuries after the construction of the Aubrey Holes and Stonehenge earthwork and the Bulford pits are somewhat obscure. That Stonehenge was in use as a cremation cemetery in this period is now well established Willis et al. 2016). Elsewhere, inhabitation is difficult to detect. Coneybury Henge could have been constructed at this time, but is perhaps more likely to be somewhat later. It is possible that the lines of timber uprights standing within the arc of solution hollows north and east of Lark Hill originated in the 28th century, at least in part.
Dates from MoD Durrington begin in this period, but this activity could be as late as the 26th century, only very slightly earlier than another major phase of building across the Stonehenge landscape. Other evidence includes the Chalk Plaque Pit, which has an even broader range of dates (see Davis et al. forthcoming for a reappraisal of the chalk plaques).

Iconoclasm or continuity?
The 26th and 25th centuries see the floruit of truly monumental construction in the Stonehenge landscape. This is the period in which the Trilithons and Sarsen Circle were erected; in which the henges at Bulford were built; of the Durrington Walls buildings, timber circle and henge; and the large post on the hilltop at Bulford. But it was also at least the start of the dismantling of the timber uprights within the arc of solution hollows, a process that may have taken two centuries or more to complete. Also dismantled in this same period of the 25th to 23rd centuries was the bluestone circle on the banks of the Avon.
This period is also marked by the introduction of Beaker ceramics and culture, and possibly people. It is tempting to read the sequences of removal and rebuilding as an episode of iconoclasm, but there are indications of continuity across the period. The most obvious is Stonehenge itself, in which the primacy of the rising sun is made ever more apparent, but there are others. At Bulford, the animal bone assemblages in the Woodlands pits contain a number of significant elements, not least the remains of a large raptor. While definite confirmation of the identification remains to be achieved, it seems likely that the raptor was a white tailed (sea) eagle, a species also recovered from the ditch at Coneybury henge (Richards 1990). Dates for the Coneybury deposit place it slightly later than the Bulford pits, at around 2750 cal BC, but intriguingly the same ditch deposits also contained the incomplete skeletal remains of a dog, which was also recovered from the ditch fills of the eastern henge at Bulford, and from postholes at Durrington Walls (Parker Pearson and Gaffney 2016). The deposition of elements of these same two species in ceremonial locations some 4.5 km apart over a period probably of some centuries indicates a shared and continued vocabulary of symbolic meanings previously only hinted at.

What was Stonehenge?
The other major trajectories of continuity are of course the solar and lunar alignments built into many of the sites in the region. Opinion is currently towards the midwinter sunset being the most significant of the Stonehenge alignments, mostly because processions into the circle along the Avenue are in that direction, and due to the differential dressing of sarsens (for instance Sims 2006;Ruggles 2009; but see Bowden et al. 2015, 45 -'Stonehenge 2 is aligned on midsummer sunrise'). Neither is relevant to the initial phases of the site, and it is very much the case that it is midsummer aspects that are the focus of the ceremonial architecture of the fourth millennium. It need not be the case, of course, that multiple alignments were not (or could not become) significant, as is clearly the case with various solar and lunar references at Stonehenge and elsewhere.
The incorporation of general solstitial aspects and precise solstitial alignments into the ceremonial architecture of the area throughout the Neolithic, together with the timing of human activities taking place within them (as attested by, for instance, the age of pigs at slaughter at Durrington Walls (Wright et al. 2014)) indicate thatwhile these places were not calendarsthey were calendrically-attuned. It seems beyond reasonable doubt that the gatherings that took place within, around or along the Lark Hill causewayed enclosure, the first Stonehenge and its cursus, the pre-henge Durrington Walls, Coneybury, Woodhenge and elsewhere did so at the points in the year which they referenced in their architecture. It seems thatby the Late Neolithic at leastthe centrifugal pull of these places was strong enough to be felt very widely across various parts of the island of Great Britain (Viner et al. 2010;Madgwick et al. 2019), although the evidence suggests movements of livestock (and presumably people) from a number of specific locations, rather than from everywhere. The physical and conceptual links between Salisbury Plain and the Orcadian archipelago are increasingly apparent (although this does not imply the same for places between Wessex and Orkney). It may be no more than idle speculation to note the almost continual daylight of Orcadian summers, with only an extended twilight -the simmer dimbetween sunset and sunrise, and the concomitant long hours of near darkness in winter. The midsummer sun aspects and alignments are what make Stonehenge and the ceremonial architecture surrounding it unusualfar more so than the architectural peculiarities of the stones themselvessince most Neolithic and Bronze Age buildings that incorporate the sun into their architecture do so at midwinter (Bowden et al. 2015, 45). Perhaps then it was the fact that the builders of the Lark Hill enclosure had entered into a relationship with the rising midsummer sun that resulted in the Stonehenge landscape becoming the heart of the sacred landscape of Wessex in the Late Neolithic.
It is this relationshipbetween the sun, and people, and timethat lies at the heart of the ceremonial architecture of Salisbury Plain over some two millennia, continually stated and restated in ever more elaborate ways. And this, then, is what Stonehenge wasthe articulation between the cosmic, sacred, otherworldly realm of the gods, spirits and the sun, and this world, the physical human world in which people lived and died, and which ensured thatdespite everythingthe two remained connected, and more than connected. Stonehengeto borrow Alasdair Whittle's phrasetranscended time (Whittle 1997, 148). No matter what it might have looked like at any particular moment in its long and complex history of building, use and alteration, Stonehenge always claimed an understanding of and connection with the awesome nature of the otherworld, of the human place in it. It provided an assurance thatno matter how the seasons cycled and the skies darkened, no matter how the days shortened -there was a pattern and that people knew what it was. Within knowledge resides power: Stonehenge guaranteed that the sun would always come back. It was a grand assurance of life.