36 



GEOLOGY OF ERIE COUNTY 



The Genundewa limestone is extremely fossiliferous. The 

 Conodont layer, especially, is rich in fish remains and in the 

 peculiar organisms which have given it its name. The limestone 

 layers immediately above the Styliola layer and included in it 

 show abundant remains of a peculiar crinoid. 



West River Shale. 



Lying above the Genundewa limestone is a mass of dark 

 gray shale which is the uppermost member of the Genesee beds. 

 To this has been given the name West river shale from its 

 occurrence in the valley of West river at the head of Canandaigua 



C 

 D 



F.'Houghton, Photo. 



Fig. 15. Cliff showing West river shale and Genundewa limestone, 

 Smoke's creek, at Benzing road. 



A. West river shale. 



B. Thin limestone and shale layers. 



C. Genundewa limestone. 



D. Moscow shale. 



lake. It was included by Hall in his Genesee slate and to 

 distinguish it from the lower black Genesee shale it was later 

 named the gray Genesee shale. It is recognized as far east as 

 Cayuga lake. 



