194< rooTE : south mahratta country. 



much distorted and cruslied out of shape, the effect, doubtless, of heavy- 

 pressure from the mass of rocks which had been piled over the original 

 shell marl. 



The shells found belong to three, or possibly four, genera, namely — 



Thym Prmsepii^ and perhaps another species. 



Lymnea. 



Unio Deccanensis, or a very closely allied species ; fragments only 

 found. 



The other form of Physa is a shell equally sinistral in whorl with 

 Ph. Prinsepii, but much like an Achatina in shape. 



The Lymnece strongly resemble a long elegant form figured by 

 Hislop in his very able paper on the geology of the Nagpur 

 country.* 



A broken specimen of Unio Deccanensis was found by a horse- 

 keeper in the bed of a nullah ten and a half miles east of Mamdapur near 

 Melikeri (Mehlee Kehree) , a place which there was no opportunity of 

 re-visiting to trace the source whence the fossil was derived. 



The intertrappean beds near Mamdapur in Gokak taluq present the 



appearance of having been formed on the margin 

 Mamdapur section. 



of a lake. There is a considerable show of bright- 

 red sandy marl, the red color being due to the presence of bole in some 

 quantity. Under the marl is a thin bed of sandstone resting upon other 

 red sandy marl which overlaps on to the gneissie rocks to the east. The 

 whole surface is greatly cut up by atmospheric action, but near the 

 centre a solitary small outlier of spherically weathered basaltic trap caps 

 the upper marl beds. The underlying trap is exposed in sundry small 

 gullies, and is seen to fill a depression in the gneiss surface. The 



* Quarterly Journal of the Geological Society, Vol. X, p, 470. 

 ( 194 ) 



