mi 1 MUSEUM 



The 1 o • ■:■ II- Id rb< rg rocka of Onondaga county are mostly 

 dark blue and i ined, occurring in beds 1 to 5 feet thick. 



Th( ither to a bluish gray. Most of them are fairly pure 



but at times contain some magnesia or clayey material. The 



the important lime producers and are used for 

 Btructura] work in the com 



of hydraulic limestone lie near the top of the group, 

 line: to Luther are often separated by 4 feet of impure 

 lin In the i i part of the county the upper layer La 



4 feet thick, but it pinches out in the Splitrock quarry west of 

 reappear again near "Marcellus Falls, where it is 2 

 l 10 inches thick in Watkins quarry, and reaches 4 feet in 

 Tigan's quarry at Ska nea teles. As at the latter place it is 

 only separated from the l«»\ver bed by a shaly layer, the two 

 •tically form one bed 9 feet 6 inches thick. 

 At Manlius the beds are separated by 4 feet of blue lime- 

 stone and at Street's quarry near Onondaga Hill by 1 foot 8 

 inches, at Marcellus Falls by 1 foot 7 inches, and at Skaneat< 

 they are together. 



Luther the following thicknesses for the lower waterlime 



r in Onondaga county. 



FEET INCHES 



Manlius, J. Behan's quarry . . 4 



Qle, K. B. Alvord 4 



Brighton, Britton and Clark 5 



steles, Corrigan's quarry 5 



A* Splitrock the upper member occurs in the southeastern part 

 of the quarry but is wanting in the western portion, its place 

 g occupied by a 9 foot bed of blue limestone. 

 The hydraulic limestone in Onondaga county is brittle, com- 

 pact, fi] I even grained. It is dark colored with a conchoidal 

 at weathers to a light color. The beds are generally 

 but do nol as a rule contain any fossils. The rock 

 ered in l v l^ in connection with work on the Brie 

 aL A- in other attempts were made to burn the stone 



