

I860.] -WEIGHT LIAS AXD B0XE-BED. 3S7 



No. Litiiology. Thickness. Organic Remains ; and tub 



ft. in. Local Names of the Beds. 



31. Fine-grained greenish marl ... o Esthcria-bed. Estheria minuta, 



in clusters. 



32. Blackish shales, not laminated 12 G 



33. Close, laminated, micaceous, 

 greenish -black shale 1 



34. Closely laminated shale 6 



3.3. Laminated shale 1 Upper Pullastra-bed. Aoicula 



contorfa, Pullastra arenicola, 

 and Cardinal. 

 30. Hard, close shale, not laminated 2 G 



37. Dark clay and shale G 



38. Strong laminated clay, with 

 septaria 1 3 Pecten-bed. Pecten Valoniensis. 



39. (lay, with shells 1 8 



40. Elaek, hard, laminated clay ... 4 



41. Pyritic stone, with shells 1 Lower Pullastra-bed. 



42. Black clunchy clay 8 



v 43. Light, soft, brown clay. 



The Bone-bed lias been found at Temple Grafton; but it is re- 

 presented in some of the other sections by a pyritic sandstone, in 

 which no true bone-breccia has been found. 



Fossils of the Avicula contorta Zone. — The Bone-bed lias yielded 

 of Reptiles — Ichthyosaurus; femur at Garden Cliff; vertebra) at 

 Frethern, Aust, and Wainlode. Plesiosaurus ; vertebrae at Garden 

 Cliff and Aust. 



Besides these determinable bones, there are a great number of 

 Saurian bones which cannot be named, on account of their frag- 

 mentary condition. 



In l s 41 Sir Philip Egcrton read a paper before the Geological 

 Society on the occurrence of Triassic lushes in British strata, and 

 enumerated several species of Placoids and Ganoids, obtained from 

 the Bone-beds of Aust and Axmouth, which, in conjunction with 

 M. Agassiz, he considered as Triassic Bpecies. In his conclusions from 

 this [chthyologic evidence, Sir Philip stated that ''he 1'cols justified 

 in advancing from the facts adduced in this communication, that the 

 beds in question (the Bone-beds) hitherto considered as belonging to 

 the Lias must be removed from thai formation, inasmuch as they 

 present a B( ries of Fishes nol only specifically distinct from those of 

 the Lias, bul possessing in the ganoid genera the beterocerque tail, 

 an organism confined to the Pishes which existed anterior to the 



Liasf." 



In the following Table I have given lists of the species of Fishes 

 hitherto found in the Bone-beds of England, and I have added from 

 Bro mi's -Index Pals tontologicus,' the rock and Locality where the 

 same Bpecies are said to occur on the Continent. 



* Lithology and thickness obtained by sinking. 



t Proe. QeoL Boo. \ul. iii. p. 409(184] , 



