New York State Museum Bulletin 



Entered as second-class matter November 27, 1915, at the, Post OSce at Albany, NY, 

 imder the act of August 24, 1912 



Published monthly by The University of the State of New York 



Nos. 217, 218 



ALBANY, N. Y. January-February 1919 



The University of the State of New York 

 New York State Museum 



John M. Clarke, Director 



THE' PALEOZOIC ROCKS OF THE CANTON 

 QUADRANGLE 



BY 



G. H. CHADWICK 



PAGE 



Introduction.' _. ^5 



The geological formations 8 



General statements 8 



Potsdam sandstones 11 



The basal contact 17 



The concealed zone 20 



Theresa mixed beds 24 



Heuvelton white sandstone ..... 26 



Bucks Bridge mixed beds 28 



Beekmantown (Ogdensburg) 



dolomite 36 



Possible Trenton limestone outlier 39 



Resume of stratigraphy 41 



PAGE. 



The geological history 42 



Interpretation of the Paleozoic 



record 42 



Subsequent geologic history .... 47 



Surface geology 48 



Preglacial and glacial 49 



Postglacial shoreUnes 50 



Later features 51 



Economic resources 52 



Sandstones and limestones 52 



Iron ore ' . • 53 



Literature and maps 53 



Index 59 



ALBANY 



THE UNIVERSITY OF THE STATE OF NEW YORK 



1920 



Miisr-Ni8-isoo 



