Acknowledgements

I would like to express my gratitude to Dr F. Mahammed, director of the Geology and Hydrocarbure Museum of SONATRAH (Algeria) for her generous financial support for the manufacture of flint thin-sections and the diffraction analysis made under the supervision of Dr L. Mami and N. Khoual-Sihamdi. I am also grateful to Pr R. Ait Aouali (Institute of Geology, Department of Algiers) for his inestimable scientific support for the interpretation of microfacies, and to Dr L. Benslama with other colleagues, too numerous to mention, for their contribution to the field survey and discussion. I would also like to thank Mr. A. Sari, a researcher at the Nuclear Research Center of Birin for X-ray diffraction analysis.

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