14 GEOLOGY 



tertiary beds* of Captain Grant could not be determined. The ' tertiary 

 beds ' were distinguished by Dr. Carter, in his Summary of the Geology 

 of India., as Miocene, but Messrs. D^Archiac and Haime in the " Fauna 

 Nummulitique de Flnde^^f class both ' Tei-tiaiy beds' and Nummulitic 

 limestone as Eocene, and show that, in Sind, the fossils of the one are 

 accompanied by the Nummulites of the other. Dr. Carter, in a note to 

 the second edition of his ' Summary' in the Collection of Geological 

 Papers on Western India, p. 743, accepts the same view. At the same 

 time, Messrs. D'Archiac and Haimef point ovit the j)robability of a 

 separation of the Eocene strata into different sub-divisions, characterized 

 by distinct fossils. 



The circumstance that all the fossils described by Sowerby from 

 the nummulitic limestone appear to have been distinct from those found 

 in the (non-nummulitic) tertiary beds of Cutch, renders it probable that 

 some division may be made. But this must await further examination. § 



Traps. — I have already stated that the basaltic rocks of Cutch are 

 perfectly identical in mineral character with those of Malwa, Bombay, 

 and the Deccan ; that they are bedded and consist of a series of flows, 

 unquestionably, as I believe, sub-aerial in their origin. The chief point 

 in which, in Cutch, they are distinguished from the trap flows of the 

 Deccan is in their aggregate thickness, which, in Cutch, appears to be 

 about 1,800 feet. II In the Deccan it is only known that it greatly exceeds 

 twice that thickness. Whether the diminished amount is due to the 

 denudation undergone in Cutch previous to the deposition of the tertiary 



* At the time that Captain Grant wrote, nummulitic limestone was generally considered 

 pre-tertiary. 



t Pp- 358, 359. t 1. c. p. 359. 



§ It will be shown that there is probably a difference between the upper, portion of the 

 series of beds newer than the traps, and the lower portion which is associated with num- 

 mulitic limestone near Surat, and this distinction probably holds good elsewhere. 



II Their outcrop extends over four miles of countiy, and their dip averages 5°. 



( 30 ) 



