J. F. BLAKE ON THE KIMMERIDGE CLAY OF ENGLAND. 



217 



sidered local features. The whole represents the Astartian group 

 of foreign geologists. 



The fauna of this section will be found to have been considerably 

 added to. 



The total thickness of this section cannot well be ascertained. It 

 has been estimated at 300 ft. to 500 ft. in Eingstead Bay, and cannot 

 be much less than 400 ft. in Lincolnshire. 



Although the greatest developments of the two sections are not 

 known upon the same area, yet we must add the two thicknesses 

 to obtain the possible total, which produces 1050 ft. exclusive of 

 passage-beds. 



The Kimmeridge Passage-beds are developed only in the presence 

 of the Coral Bag, whose fossils ascend into them, but not to any 

 appreciable extent above. 



They are typically developed at Weymouth, where they are about 

 20 ft. thick. 



The Oxford and Kimmeridge Clay seem to be bound together by 

 many forms in common. 



Appendix A. 



Table showing the Vertical and Horizontal Distribution of all recorded 

 Kimmeridge-clay fossils. 



B, Buckinghamshire ; C, Cambridgeshire ; D, Dorsetshire ; L, Lincolnshire ; 

 N. Norfolk ; O, Oxfordshire ; W, Wiltshire ; Y, Yorkshire ; Large letters 

 when the species is common, small when it is rare ; * , Present. 



Names. 



o a 



a 



o 



hi 



a 



u * 



8,3 



Pterodactylus, sp 



Gigantosaurus megalonyx,#^y 1 



MS J 



Ischyrosaurus 



Megalosaurus Bucklandi, Ow. ... 

 Cetiosaurus humero-cristatus, \ 



Hulke J 



Plesiosaurus affinis, Ow 



brachyspondylus, Ow 



brachistospondylus, Hulke .. 



Manselii, Hulke 



dasdicomus,. Ow 



ellipsospondylus, Ow. 



plicatus, Ph 



trochanterius, Ow 



validus, Ph 



hexagonalis, Ph 



megadeirus, Seeley,MS. 



stenodeirus, Seeley, MS. 



Pliosaurus brachydeirus, Ow 



gamma, Ow 



c? 



d 

 w 



d 



o 

 OC 



o 

 o 

 o 

 o 

 O 

 o 

 c 

 c 

 10c 

 o 



