Figures 16a and 16b: Iron Age entries: the distribution of the provably Iron Age material has the expected general concentration in the east of the region, with less extensive concentrations elsewhere, plus areas where evidence is sparse or non-existent (16a). When entries possibly of that date are considered (16b), the picture is transformed, data points increasing fourfold, previously noted concentrations being reinforced, and further densities appearing elsewhere. Presumably the real extent of known Iron Age activity lies somewhere between these extremes.
| Yorkshire Location Map | a. Iron Age Only | b. Iron Age All |
| with elevation | with elevation |