I v TORE BTA i B MUSEUM 



Th< Onondaga lii in Erie county forma a thin 



hydraulic limestone and the overlying Cornif- 



lt varies in color from blue gray to a light 



in thid reaching its maximum of 35 



I in ] quarry at Williamflville. It is the same 



thickness i* milea farth but then begins to thin out rapidly. 



nity, instead of being of one continuous 

 ally a icular masses occurring at the same 



n. The Corniferous limestone in Erie county forms some- 

 what of an escarpment, as already mentioned. The rock outcrops 

 • not as a rule very extensive, but good ones occur a few miles 

 below Millgrove near a dam across Endicott creek, and again in 

 the bed of the same stream for 3 miles below Wilhelm, and also 

 it the same place. Again this limestone is found in Gage 

 Ki< ;i'er's quarry near the transit road about a mile west 

 ■r. 



Hydraulic limestone. This extends through Williamsville, 

 ( lan-nee and Akron. Along the whole line of its outcrop it has 



in quarried at numerous places but generally only for building 



pur Tl:< section at the works of the Buffalo cement co. 



the following relations of the three limestones: flint and 



lim< . Corniferous, 3 to feet: Onondaga lime, 5 feet 8 



inches; Loose friable limestone, 6 indies: gypsum crystal, 6 inches; 



Iraulic limestone, porous, known as bullhead, 1 feet; cement 



k used for burning, 3 feet 8 inches; impure hydraulic lime at 

 bottom (pL 36), 



The bullhead stratum furnishes the greater part of the water- 

 lime used for building purposes. 



limestone. One or two of the lenticular masses al- 



mentioned occur near Williamsville in the quarry of Fo- 



Xoung. It Lb highly f ossiferous and quite pure, 



as shown by the following analysis made by H. Carlson and quoted 



by Bishop. 1 



l Geology of 1 .-. (see 15th an. rep't N. Y. state geol. p. 331) 



