IN THE ANGLO-PARIS BASIN g 



and support which has made the present work possible. In particular, I wish to 

 thank the late Professor J. H. Taylor, and my supervisor Dr. J. M. Hancock for the 

 considerable help and hospitality afforded to me as a research student at King's 

 College, University of London. Without the facilities provided by the various brick, 

 tile, and cement companies, by national, regional and local authorities, and by 

 private landowners both in England and France, all mentioned in the text, it would 

 have been impossible to carry out the work at all. 



The following organisations and members of them have aided the work and to these 

 my thanks are due : my colleagues in the Department of Palaeontology, British 

 Museum (Nat. Hist.), in particular, Dr. H. W. Ball (Keeper), Dr. E. I. White (former 

 Keeper), Dr. M. K. Howarth and Mr. D. Phillips, Dr. R. P. S. Jefferies, Mr. H. A. 

 Toombs ; the Director of the Institute of Geological Sciences Dr. K. C. Dunham, Dr. V. 

 Wilson (Assistant Director), Mr. S. C. A. Holmes (District Geologist S.E. District), 

 Mr. R. V. Melville (Chief Palaeontologist) and Dr. F. W. Anderson, Dr. D. A. Gray 

 (Water Department), Mr. L. S. O. Morris (Boring Department), Dr. R. Casey, and the 

 members of their staff for making available outcrop and borehole material ; the Gas 

 Council, Mr. P. Hinde (Head Geologist), and the late Professor V. C. Illing for per- 

 mission to examine the Winchester and Cliffe groups of borings ; the Board of 

 Directors of British Petroleum Ltd., Dr. P. E. Kent (Chief Geologist) and Dr. A. J. 

 Martin, for making available borehole material and information ; Mr. S. B. Thomas 

 (Ministry of Transport, Channel Tunnel Division), M. R. Malcor (Channel Tunnel 

 Study Group), Mr. E. W. Jaccomb Hood (Channel Tunnel Site Investigation), and 

 Mr. D. J. Carter (Imperial College) ; Mr. A. G. Brighton, Sedgwick Museum ; Brig- 

 adier G. Bomford, Mr. F. H. Edmunds, and Dr. W. J. Kennedy, Oxford University ; 

 Miss J. Royston, Buckingham County Museum ; and Mr. H. J. Bick (Central Electric- 

 ity Generating Board). It is a pleasure to thank Mr. C. W. Wright for the loan of 

 specimens and information. 



My special thanks are due to Dr. P. Destombes for his hospitality, and introduction 

 to sections in the Pays de Bray and in the Yonne and Aube. M. J. Fourcher (Rouen) 

 provided access at very short notice to the Bucaille Collection. I am indebted also 

 to Dr. J. A. Jeletsky of the Canadian Geological Survey and Dr. Keith Young of the 

 University of Texas. 



I am particularly grateful for financial aid from the following authorities : the 

 Godman Fund, the Educational Authority of the London Borough of Bromley, the 

 Central Research Fund of the University of London, the G. W. Young Fund of the 

 Geologists' Association, and my parents. I wish to thank my wife also for her help 

 in various ways. 



III. DESCRIPTION AND CORRELATION OF SECTIONS 



A good deal of stratigraphic information can be displayed to advantage in the form 

 of diagrams, and so all the lithological sections are presented as text-figures. 

 Correlation charts, however, cannot provide the necessary accuracy when used alone, 

 and require an accompanying text. Only the critical ammonites are mentioned in 

 this section as a more detailed list and its stratigraphical distribution is given later. 

 For ease of description the account is divided into convenient geographical areas to 



