OF CUTCH. 15 



rocks, or whether the traps were originally of smaller vertical extent 

 in this country, is a subject on which no opinion can be at present 

 expressed. 



So far as my examination extended, the traps rested upon the Juras- 

 sic beds. If any traps are interstratified with the secondary formations, as 

 Captain Grant states,"^ they must belong- to a distinct series from the 

 Deccan and Malwa traps, and consequently, — if I am correct in identifying 

 the two — from the principal masses seen in Cutch, for the Malwa traps, 

 as will be shown in a future paper, rest unconformably upon the middle 

 cretaceous beds of Bagh, and must therefore be of much later age than 

 the Jurassics of Cutch. 



Throughout a portion of the Jurassic area, as shown by Captain 

 Grant, small hills of trap abound. They appeared to be intrusive and are 

 very probably the nuclei of outbursts of the Deecan and Malwa trap 

 period, and from them may have proceeded the lava flows which intervene 

 between the Jurassic and Nummulitic formations. 



Alluvial Deposits. — As in many other parts of India these fringe the 

 coast which is said to be constantly gaining. The most important 

 development, however, of these deposits in Cutch appeared to me to be 

 the Runn, which I am disposed to consider the bed of an inlet of the 

 sea filled up by the accumulation of detritus brought down by the 

 rivers. It is just at present in the debateable state, water part of the 

 year, land another part, but every year must increase the height of the 

 land surface, and consequently diminish the depth of the water at the 

 period of the overflow. Of course the whole may be an area of depres- 

 sion, but further proofs of this are necessary than the fact of a small 

 portion having been sunk, and another part raised, by the earthquake 

 of 1819. 



* Geological Trans., 2nd Series, Vol. V, page 312. 



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