160 P. REPOBT OF PROGRESS. E. W. OLATPOLE. 



tioned probably represent here the Block ore and Bird's-Eye 

 fossil ores of Shade mountain. 



Polecat valley gradually widens to the westward by the 

 coming in of the limestone and shales, and also by the in- 

 creasing thickness of the Onondaga, but through this town- 

 ship the Clinton group is mostly covered with timber and 

 difficult of examination. 



The Onondaga group. 



As the shales of this group flatten down and also attain 

 their full thickness, the Polecat valley which is due to their 

 erosion, widens out and is cleared of timber and cultivated. 

 The beds at the top of this group — the variegated and grey 

 shales — reach their full development in the western part of 

 this township. But I have been unable to trace their gradual 

 increase or determine their lower limit. 



The Lower Helderberg group. 



The rocks of this group which first appear near Sterrett's 

 gap (the iiint shales) gradually increase in thickness west- 

 ward, lower beds continually coming in until near the mid- 

 dle of the township the upper part of the group has be- 

 come solid enough to yield limestone for the kiln at Mr. 

 Brownell's. The beds here are soft and much decomposed 

 at the outcrop. The lime has been much dissolved out. 

 They are fossiliferous and yielded me several of the species 

 common in the lime shale. The lower part of the division 

 including the more solid limestone beds does not make an 

 ax>pearance at this point. The rocks of this group how- 

 ever make a noticeable ridge along the valley which becomes 

 very conspicuous farther west. The limestone has been 

 very largely quarried and burnt near the north line of the 

 township at Mr. John Bear's. The coral bed is here largely 

 developed and the corals silicified. See section below. 



Bear 's limestone quarries. 



The quarries from which a large quantity of limestone 

 lias been taken occupy the same horizon as Garber's quarry 



