268 



New York State Museum 



absence of beds in the three sections. No exposures have 

 been found west of the central part of the state. 



ORDOVICIAN SYSTEM 



Central 



East Central 



Eastern 





Cincinnatian 



Cincinnatian 



Cincinnatian 





(Upper) 



(Upper) 



(Upper) 





Oswego ss. 













Lorraine beds 









Pulaski sh. 













Frankfort sh. 



Frankfort sh. 



Indian Ladder beds 





Utica sh. 



Utica sh. 









Mohawkian 



Mohawkian 



Mohawkian 





< Middle) 



(Middle) 



(Middle) 





Trenton beds 



Trenton beds 



Trenton beds 





Dolgeville sh. 



Schenectady sh. 



Schenectady sh. 





Trenton l.s. 



Canajoharie sh. 



Canajoharie sh. 









(Snake Hill sh. of same 







age farther east) 









Glens Falls l.s. 



Glens Falls l.s. 



•o. 



Black River beds 



Black River beds 



Black River beds 



— 







Amsterdam l.s. 



Amsterdam l.s. 



o O 



Watertown l.s. 











"w 



Leray l.s. 



Leray l.s. 



Leray l.s. 



3 "3 " 



Lowville l.s. 



Lowville l.s. 



Lowville l.s. 



^ c-c 



Chazyan 



Chazyan 



Chazyan 



SH 



(Lower) 



(Lower) 



(Lower) 





Chazy beds 







Chazy beds 



z-5 <£ 







■ 



Valcour l.s. 





Pamelia l.s. 





















Crown Point l.s. 













Day Point l.s. 







CANADIAN SYSTEM 





Central 



East Central 



Eastern 





Middle and Upper 



Middle and Upper 



Middle and Upper 



a 



Beekmantown beds 



Beekmantown beds 



Beekmantown beds 



\3 v 



Ogdensburg dol. 







Beekmantown l.s. 









(incl. div. C-E ana 







B in part) 





Lower 



Lower 



Lower 





Tribes Hill l.s. 



Tribes Hill l.s. 



Tribes Hill l.s. 





Schaghticoke sh. 



{farther east) 



The Schaghticoke shales (Ruedemann '03) are typi- 

 cally exposed along the Hoosick river, at and in the vicin- 

 ity of Schaghticoke, Rensselaer county, and constitute the 

 lowest beds of the Canadian in New York State which 

 do not occur farther west (figure 31). Lithologically 

 they are similar to the Deepkill beds (p. 272), and are 

 thin, equally bedded, alternating greenish and black 

 shales, with intercalated thin barren limestone bands. 



