318 



New York State Museum 





SILURIAN SYSTEM 



East Central 





Eastern 



Cayugan 





Cayugan 



(Upper) 





(Upper) 



Manlius l.s. 





Manlius l.s. 



Rondout w.l. 





Rondout w.l. 



Cobleskill l.s. 





Cobleskill l.s. 



Salina beds 





Salina beds 



Bertie w.l. 



•3 



/ Rosendale w.l. 

 \ Wilbur l.s. 



Camillus sh. 



1 



Binnewater s.s. 



Syracuse salt 







Vernon sh. 



m 



High Falls sh. 



Pittsford sh. 



(Longwood sh. of Orange co.) 



Niagaran 





Niagaran 



(Middle) 





(Middle) 



Lockport dol. 







Clinton beds 





Clinton beds 



Rochester sh. and s.s. 





(Fossil ore) 







Shales and s.s. 







Williamson sh. 







(Oolitic ore) 







Middle Clinton sh. and s.s. 



Shawangunk cgl. 



Sodus sh.? 







Oneida cgl. 







Medinan 





Medinan 



(Lower) 





(Lower) 



Brayman shale probably represents a residual soil of the Ordovician. 



The Queenston shales (Grabau '08; Lewiston, Chad- 

 wick '08) were named from the exposure in the banks 

 of the Niagara river at Queenston, Ontario. This for- 

 mation consists of red and green shales and green and 

 gray sandstone and, as stated above, is part of a river 

 delta deposited in the Appalachian trough during the sub- 

 mergence in Richmond (Lower Medinan) times and ex- 

 tending from southern Virginia and Maryland through 

 Pennsylvania, New York and southern Ontario. In New 

 York these beds have a maximum thickness of 1200 feet 

 and are confined to the western part of the state where 

 they are well exposed in the Niagaran area (Lewiston, 



