CHAP. 7.] EOCK FORMATIONS. — TERTIARY. 77 



vertebra and teeth. In one place some Anomia (PatroJ elyros, Gray (?), 

 and oysters were found within a few feet of the nummulitic 

 bedsj which rest apparently in regular conformity upon these; while 

 in another some mottled and variegated friable clay shale and lateritic 

 beds intervened between the two sub-groups. The thickness of this 

 sub-division may vary from 50 to 150 feet. 



C. — The nummulitic group of Kutch consists of pale yellow and 

 white marly impure limestones with some sandy 



Nummulitic group. 



beds and shaly marls. The Nummuhtes as usual 

 abound, comprising several varieties; and Alveolina (FasciolitesJ are 

 locally numerous. 



Many Echinoidea occur in the upper white beds, Clypeaster, 

 Spatangus, and Galerites most usually and locally abundant; and they 

 also contain a few bivalves and gastropods, including Pecten, Pinna, 

 Spondyliis, Ostrea, Tiirritella, Cerithium, Conus, &c. Rib-bones are also 

 sometimes met with. 



Some of the nummulites are peculiar to certain zones in the group, 

 and at the period when these deposits ceased corals seem to have flourished ; 

 large coral masses being found wherever the upper beds occur. These 

 great brain-corals are, however, so crystalline in general that little of the 

 organic structure can be seen except on a large scale. The isolated and 

 flat-topped hill of Gade-Puthar, near Khoodee and five miles south of 

 Narainsir, is probably an old coral reef. 



The stratification of the nummulitic group is regular and parallel 

 as might be expected in pelagic deposits ; but the whole group dies out 

 or disappears with much obscurity at the eastern limit assigned to it 

 upon the map : slight representatives of it, however, re-appearing much 

 to the south-east or to the east of its general development, the margin 

 of which on that side is not only disturbed and faulted, but the rocks 

 are much concealed by sub-recent alluvial and river deposits. 



( 77 ) 



