EXCHANGE 



New York State Museum Bulletin 



Entered as second-class matter November 27, 19 15, at the Post Office at Albany, New York, 

 under the act of August 24, 191a 



Published monthly by The University of the State of New York 



No. 191 



ALBANY, N. Y. 



November i, 191 6 



The University of the State of New York 

 New York State Museum 



John M. Clarke, Director 



GEOLOGY OF THE VICINITY OF OGDENSBURG 



(Brier Hill, Ogdensburg and Red Mills Quadrangles) 



BY H. P. CUSHIN 



PAGE 



Introduction 7 



Location and character 8 



General topography 9 



Glacial deposits 10 



General geology 12 



Descriptive geology 12 



Precambrian rocks 12 



■ Igneous rocks 17 



Structures of the Precambrian 



rocks 22 



Paleozoic rocks 23 



Character of the Precambrian 



surface under the Paleozoics 24 



Cambrian (Ozarkian) formations 25 



Theresa formation 28 



PAGE 



Ordovician formations 35 



Tribes Hill formation 35 



Ogdensburg formation 37 



Structures of the Paleozoic 



rocks 52 



Historical geology 53 



Precambrian time ^ . . 53 



Cambrian time 55 



Ordovician time 56 



Later Paleozoic history 57 



Mesozoic history 58 



Tertiary history 58 



Quaternary history 59 



Index 63 



M8ir-Jli6-isoo 



ALBANY 



THE UNIVERSITY OF THE STATE OF NEW YORK 

 1916 



V 



