SCHOHARIE GRIT. 131 



18. SCHOHARIE GRIT. 

 Shell Grit. 



This mass, which exists in the first district, must disappear near Cherry- Valley, a few 

 loose pieces only having been found to the northeast of the village. It is not confined to this 

 State, but is also found in Pendleton, Madison county, Indiana, where it is readily recognized 

 by its peculiar mineral character, the rock being a calcareous fine-grained sandstone, from 

 which, when long exposed, the carbonate of lime disappears without altering the form of the 

 rock ; and by its fossils, the genus Pleurorhynchus, for example, being as abundant in it as 

 in the New- York grit. 



As this rock is highly fossiliferous, and most of 'the fossils are peculiar and confined to it, 

 though their existence was at first but merely suspected, it could not be passed unnoticed. 



