K 



22 .1 



Carbon dioxid -IT 



100.'".:. 



If thi> rook 1 tlii- -nine character at other points, it 



m it to be an important bed, and to determine this 



litional analyses were made by Mr Newland. The first of 



these rep average of several samples taken from 



Snow's quarry at ter. 



Silica 7 



20 . 05 



Lime 30.5 



A Imping 95 



id 8 



bon dioxid 45 . 24 



Ignition 073 



Undetermined 2 . 687 



The last analysis is of a sample from the Copeland quarry in 

 Re- •, collected by G. van Ingen. 



Silica 29 



Alumina 43 



Ferric oxid 4G 



98 <>n ignition 07 



Lime carbonate 5G . 01 



Magnesium carbonate 43.3 



100.56 



the rock to he an almost pure dolomite. 

 ( inl 90 occurs in Monroe county, and is to be seen 



outcropping at the middle falls in the gorge of the Genesee river 



