IN THE ANGLO-PARIS BASIN 97 



lighter coloured subdivision which contains some material scoured out from the 

 spathi Subzone sediments, and a predominant element derived from sediments of 

 intermedins Subzone age. Indigenous Anahoplites intermedins and Inoceramns 

 concentricus occur in the upper subdivision indicating that it is undoubtedly of 

 intermedins Subzone age. The derived intermedins Subzone material includes 

 species of Anahoplites which occur at the extreme top of the spathi Subzone and basal 

 part of the intermedins Subzone in England. 



Bed 5 is still pebbly in its lower 1 foot (0-30 m.) but it has not yielded fossils to the 

 writer. Marie indicates that at about the middle of Bed 5 at the base of an argil- 

 laceous member the Upper Albian commences. 



(g) Summary 



The sections described briefly above provide a picture, albeit very imperfect, of 

 Middle Albian sedimentation across the basin of deposition extending from the 

 Kimmerian modified Palaeozoic massifs of the Ardennes on the NE. side to those of 

 Morvan to the SW. (text-fig. 43). 



The only information available about the sediments of eodentatus Subzone age come 

 from the sections near Maurupt and Les Cotes Noires, in the NE. It is a curious fact 

 that as yet it has not been detected in the Aube or Yonne. This must be due to a 

 lack of exposures for the sequence in the mammillatum Zone in the area of the Bois 

 de Perchois (Aube) is very thick and the Middle Albian sediments here are also 

 apparently of considerable thickness. In England deposits of eodentatus Subzone 

 age are in general very condensed and ammonites are not common except at a very 

 few localities. Species of Hopiites (Isohoplites) form the majority of the ammonite 

 fauna, and its usual associate in France Lyelliceras of the camatteanum group, is 

 exceedingly rare in England. 



Deposits of lyelli Subzones age already proven at Clermont-en-Argonne are also 

 apparently thicker at Les Cotes Noires than in the Aube, but the lithological sequence 

 is comparable from Les Cotes Noires to the St. Florentin area (Yonne). 



At Revigny-sur-Ornain it is obvious that the spathi Subzone is represented by 

 thick sediments especially the upper part. Unfortunately, the top of the Subzone 

 has not been exposed at Les Cotes Noires, but at Courcelles the upper part of the 

 Subzone is represented by a single nodule bed. No information is available about the 

 sequence until the St. Florentin area is reached where, between Montlehu and St. 

 Florentin itself, there is a change from the argillaceous f acies of the Aube to the sandy 

 facies of the Puisaye. 



The intermedins Subzone is now known from five localities. It is quite thick at 

 Revigny-sur-Ornain and the top of the Subzone was not determined in the sequence. 

 Intermedins Subzone ammonites were determined by Breistroffer at Montierender 

 (Haute Marne) and Le Plessis (Aube) (P. & J.-P. Destombes 1965 ; 262). Only the 

 basal part of the Subzone has as yet been determined at Courcelles. At St. Florentin 

 and at other localities in the Puisaye, the Subzone is represented within condensed 

 deposits. No other Middle Albian Subzones are as yet known in this area. 



Very little information is available about the stratigraphy of the Gault between 



