136 



THE LIAS AMMONITES. 



position which it ought to occupy in the extent of the marls of the Lias. The same 

 species are not equally abundant in all localities ; and this proves to us that the species 

 of former times, like those of the present day, did not frequent indiscriminately such and 

 such regions."^ 



In Normandy the lower zones of the Upper Lias have been studied with great care by 

 Professor Deslongchamps, and many of the remarkable fossils they contain have been 

 figured and described in his interesting ' Meinoire sur la Couche a Leptcena du Lias^ 

 already referred to, p. 119, in correlation with similar beds in the Upper Lias of Glouces- 

 tershire and Somersetshire. The quarries of Curcy, d'l^vrecy. May, &c., near Caen, are 

 good localities for the study of this zone, and the following section at Curcy affords a 

 clear exposure of the Upper and Middle Lias in natural position there. 



Section at Curcy, Calvados. 

 Upper Lias. 



No. 



Petrology. 



Thick- 

 ness. 



Organic Remains. 



* 



1 



2 

 3 



4 



A very ferruginous, yellowish or red- 

 dish clay, containing rolled Oolitic 

 blocks and fossils 



metres. 

 ? 



? 



7 to 8 



1 to 2 

 deci- 

 metres 



The fossils belong to the Oolitic beds, and 

 resemble a like deposit of Drift at Moutiers. 



Harp, serpentinum, Harp, bifrons, Stephan. 

 Holandrei. 



Posidonomya Bronni, Geotheutis Agassizii, Apty- 

 chus. 



Ter. glohulina, Rhyn, pygmcea, Lepteena Moorei, 

 Lep. liasiana, Lep. Davidsoni, Lep. Bouchurdi, 

 TJiecidea Mayalis, sinuata, rustica, Eugenia- 

 crinus, Plicatocrinus, Cotylederma, spines and 

 plates of EchinidcB. 



Alternate beds of limestone and thin 

 bands of clay, containing many 

 fossils 



Thick masses of very tenacious, greyish, 

 yellowish or blackish clay, with a 

 band of calcareous nodules contain- 

 ing Fishes 



"Couche a Leptcena,'^ a very thin bed of 

 reddish marl, formed of the frag- 

 ments of various fossils, and a singu- 

 lar assemblage of organic remains ... 



Middle Lias, 



5 

 6 



" The Roc," a sandy saccharoid lime- 

 stone, containing many fossils, and 

 formins; a good horizon 



metres. 

 1 to 2 



? 



Am. spinatus. Am. margaritatus, Lyt. Jimbriatum, 

 Belem. niger, Gryphcea cymbium, Spiriferina 

 rostrata, Tevebratula quadrijida. 



Rhyn. tetraedra, Rhyn. acuta, Gryphcea cymbium, 

 Harpax Parkinsoni, Terebratula numismalis, 

 Rhyn. variabilis, Spiriferina verrucosa, Spirif. 

 rostrata. 



Alternate beds of marl and limestone, 

 of variable thickness, and containing 

 many fossils 



1 Ibid., p. 66. 



2 'Bulletin de la Societe Linneene de Normandie,' vol. iii, 1859. 



