GEOLOGY AND GEOGRAPHY OF CLAY DEPOSITS 



101 



were backed up by the ice for a time, during which the valley 

 was converted into a shallow lake in which a large amount of 



Old lake bottom, Spencer, N. Y. 



aluminous mud was deposited. This material has been employed 

 for common brick. 



An idea of the depth of clay and alluvium in the Genesee 

 valley may be had from the following table : 



The figures have been taken from the records of salt wells. 

 Yorkf York Salt co. Clay 52 ft. 



Piffardf Genesee Salt co. Clay and gravel 64 ft. 



11 f Livingston Salt co. "Soil"* 158 ft. 



Cuylervillef "Soil" 184 ft. 



Mt Morris} Koyal Salt co. "Soil" 191ft. 



For other localities the following depths are given : 



Aurora-f Blue clay 15 ft. 



Wyomingf Pioneer Well Soil and clay 40 ft. 



Warsawf Standard Salt co. Surface, soil and 



clay 26 ft. 



" f Guinlock and Humphrey Clay 17 ft. 



There are a number of these deposits which are of sufficient 

 interest, geologically as well as commercially, to be mentioned in 

 some detail. 



* The term soil is probably meant to indicate sand and clay. 

 tL P. Bishop, 5th a.nn. Rep^, N. Y. State Geologist, 1885. 

 % A.nn. Rep't, Sup't Onondaga Salt Springs for 1888, p. 19. 



