28 



THE EOCENE BEDS 



This division can be well studied at Mortefontaine and La 

 Chapelle-en-Serval, at which latter locality the junction with the 

 Cakaire de Ducy (= the Horizon of Beauchamp) is seen and the 

 Sables Moyens are capped by the St. Ouen Limestone. 



Fig. io. — Upper Sables Moyens {Horizon of Mortefontaine) and 

 junction with Middle Sables Moyens. 



Section at La Chapellc-en-Serval. 





14 Vegetable earth. 



• 3 St. Ouen limestone . 

 12 VVhite sand, no fossils 



Tabular sandstone , 



Greenish clayey sand 



Limestone with Bithinia and 

 angulata .... 



Corbula 



Yellowish green clayey sand with the 

 same fossils as 6, but fewer 



ft. in. 



o 8 

 o 4 



2 9 



Yellow and brown sand, very fossiliferous 



— Potamides pletirotomoides . . 8 



fSands, yellowish and green, with many 



I fossils — Potamides tricarinatus, P. 



pleiirotomoides, P. Cordieri^ Avicula 



Defrancei, Melongena minax, M. stib- 



L carinata, &c. . . . . -33 



Marly and clayey bed with Bithinia 



pulchra . . . . . . o 8 



Argillaceous sand with fossils, as in No. 6. i 9 



3 Marly sand, with small beds of clay . .14 



2 " Cakaire de Ducy" with Bithinia tuba . o 8 



[Brown and white sands, without fossils, 

 I with a bed of sandstone in the upper 



' "I portion (Horizon of Beauchamp) 



{_ visible in part. 



From Dr. Hovelacque's notes. 



Although not very varied in species, the fossils are exceedingly 

 plentiful in this horizon, the band in yellow sand at La Chapelle 

 being literally a compact mass oi Potamides tricarinatus^ P. Cordieri, 

 P.pleiirotomoides and P. Roissyi; the colour bands and the coloured 



