IN THE ANGLO-PARIS BASIN 99 



this area and the Pays de Bray. However, a comparison between the succession 

 shown by the La Chapelle boring at St. Denis, Paris (Jukes-Browne 1900 ; 397) and 

 that of St. Florentin (Yonne) and Villers St. Barthelemy in the Pays de Bray below 

 shows that the predominantly sandy beds in the Yonne, fringing the massif of Morvan, 

 give way to clays under Paris, but the sequence is thinner. The sequence thickens 

 again northwards from Paris, and in the Paysde Bray the Middle Albian is represented 

 by clays, and the Upper Albian by an Upper Greensand facies. The clay facies 

 extends down to include at least the top of the mammillatum Zone towards the NW. 

 end of the Bray. 



(iii) PAYS DE BRAY 



The Pays de Bray both geologically and scenically resembles the Weald (text-fig. 

 33). The NE. side of the Bray dips very steeply beneath the Chalk and there is no 

 information on the sequence on this side. However, at the NW. end and along the 

 whole of the south western side the dip is much more gentle and brick-pits in the 

 Gault have been opened at a number of places. Usable information has been ob- 

 tained from only four of these : Briqueterie Ledoict, St. Martin, at the NW. end of the 

 Bray (P. Destombes 1970 and in Pomerol & Feugueur 1968) ; a section near Forges- 

 les-Eaux (P. Destombes 1958) ; and two sections in the area of Villers St. Barthelemy 

 (J. -P. & P. Destombes 1938b). The position of these sections is indicated on 

 text-fig. 33. 



The most detailed information on the Middle Albian sequence in this region yet 

 published is contained in the two papers already cited by J. -P. & P. Destombes 

 (1938b) and P. Destombes (1958). They demonstrate the presence of the eodentatus, 

 lyelli, spathi and intermedins Subzones all in a clay facies. The niobe Subzone is 

 indicated as being represented by sandy deposits (P. Destombes 1958) but no definite 

 evidence has been published to support this. This is followed by a break in the 

 sequence involving the remainder of the Middle Albian. 



(a) Villers St. Barthelemy 



Two sections were described by J. -P., & P. Destombes in this area (1938b ; 122, 

 123) . Their section 1 is no longer exposed but showed deposits of both the spathi and 

 intermedins Subzones which together are over 30 feet thick (9-15 m.). Section 2 is 

 now well exposed and shows the sequence given in text-fig. 44. 



Bed 1 (ii) contains Otohoplites spp. including 0. destombesi, Beudanticeras spp. and 

 Douvilleiceras spp., indicating the uppermost part of the mammillatum Zone. No 

 fossils were seen in the lower part of 1 (iii) and it is not possible to say whether it is of 

 eodentatus or basal lyelli age: the top of 1 (iii), however, contains crushed Hoplites 

 (H.) spp. Bed 2 contains a good bivalve fauna but only a few crushed specimens of 

 Beudanticeras cf. laevigatum, Protanisoceras (P.) sp. cf. barrense, and in Dr. P. 

 Destombes' collection, a few examples of Lyelliceras lyelli. This bed definitely can 

 be classified with the lyelli Subzone, as also can Bed 3 on the occurrence of a few 

 crushed Beudanticeras at about the middle of the sequence. The basal part of Bed 4 



