78 Mr. Dc la Beche un the Geology of Pari of France, 



A fossil crocodile, described by Cuvier, Ammonites biarmatus. 



Bones of the Plesiosaurus, sublaivis, 



A fossil fish, communis. 



An Encrinite, omphaloides, 



Trigonia clavellata, excavatus, 



Gryphaea dilatata, Perna aviculoides. 



Nautilus sinuatus, Modiola 



An undescribed Ammonite (PI. IX. fig. 4.) Ostrea ; two species. — &c. 



This blue clay forms the whole of the hill to the west of the Vaches Noires, 

 after which it is seen no more on the coast ; but the base of the hills, extend- 

 in"- in a south-east direction from Dives to Etrcez, is composed of it. The 

 hill risina: eastward of Etreez affords the same section as the west end of the 

 Vaches Noires cliffs. 



The low sandy coast which succeeds, to the westward of the hills at Dives, 

 conceals the rock upon which the blue clay of the Vaches Noires rests. The 

 best section that I obtained in illustration of the order of the beds, was on the 

 road from Caen to Etreez, where the blue clay rests upon a yellowish calca- 

 reous sand with sandstone, in alternating- layers (cornbrash). The clay ap- 

 pears to form the bed of the Dives river, to the westward of which is a low 

 chain, running south-east parallel to the high range, and principally composed 

 of blue clay, or of calcareous sand and sandstone. West of the low range the 

 country is nearly level to Caen. 



Cornbrash. — Of this I observed but little. The hill behind Moull, on the 

 road from Caen to Lisieux, is composed of a yellow calcareous sand and sand- 

 stone resembling cornbrash, upon which the blue clay (Oxford clay) appears 

 to rest ; and the latter is afterwards met with on the road to Etreez. The 

 hard strata are quarried at Moull. 



No cornbrash limestone appears on the coast: the part at which it ought 

 to occur, between Dives and Sallenelles, is concealed by sand and marsh-land. 



Forest Marble. — Beneath the calcareous sand and sandstone, and above the 

 freestone of Caen, is a calcareous rock, sometimes rather oolitic, composed in 

 a great measure of broken shells, and containing very small fossil corals ; firom 

 which last circumstance it has obtained from M. Lamouroux, in his Exposition 

 Methodique des Polypiers, the name of Calcaire Polypier. In geological 

 position and structure this limestone resembles the forest marble. It occurs 

 in the low cliffs at Luc and Lion, and probably along the whole coast from 



