CHAP. 7.] ROCK FORMATIONS. — TERTIAUY. 79 



TurritelleB, Sec, with Corhdm and Venus granosa, occur abundantly 

 in one or two of the ferruginous bands and also in nodular lumpy con- 

 glomeratic clay beds seen at intervals above, in which were found frag- 

 ments of EcJdnoidea, Foraminifera, Bryozoa, and a large species of 



The Turriiella-msivls and marly sandstones form a well marked zone, 

 in which at one locality a number of very perfect specimens of crabs 

 were obtained, and also quantities of large rib-bones with one shark's 

 tooth. A coralliae bed occurs on or about this horizon, and a little higher 

 some marly limestones and shales with a variety of fossils, OrbitolUes and 

 Opercidina being very abundant, as also Pecten, Ostrea, Venus, Garclmm, 

 Stromius, Natica, Clypeaster, Spatangus, Balanus, and small square 

 palatal fish teeth, &c., &c. 



It is probable that some of the nodular and ferruginous beds represent 

 those of Perim Island in the Gulf of Cambay, distinguished by an abun- 

 dance of large mammalian bones (described by Captain Fulljames and 

 others, Jour., As. Soc.,Beng., v., 289. See also Geol. papers on W. India; 

 Mem., Geol. Siirv., India, vol. vi, p 182) ; since one or two large 

 bones and two fine iriblars of a bilophodoht (? Lophiodon) were found in 

 the valley of the Mhuror river, in ■ ferruginous or lateritic beds believed 

 to belong to this group. 



Above the beds hitherto described are calcareous grits and sand- 

 stones with sandy beds more or less compact, and flaggy bands. In these 

 fossils are scarce, but Balanus, a small oyster, casts of Turritella, and 

 shark's teeth were found. To them succeeds a large thickness of argil- 

 laceous rocks — shales, clays, and marly beds ; the lower shaly clay beds 

 containing thin disc-shaped NummuUtes and other Foraminifera, while in 

 some of the more rubbly shales, Placuna and Placunanomia, oysters, 

 &c., are common. 



At about the middle of this great argillaceous band, the most fossili- 

 ferous beds of the whole series are found, consisting of yellow marls and 



( 79 ) 



