New York State Museum Bulletin 



Entered as second-class matter November 27, 15 15, at the Post Office at Albany, N. Y., 

 under the act of August 24, 1912 



Published monthly by The University of the State of New York 



No. 185 



ALBANY, N. Y. 



May I, 1916 



The University of the State of New York 



New York State Museum 



John M. Clarke, Director 



THE PRECAMBRIAN ROCKS OF THE CANTON 



QUADRANGLE 



JAMES C. MARTIN 



PAGE 



Introduction. 7 



General considerations 12 



Grenville series 17 



Grenville limestone 17 



Garnet gneiss 24 



Siliceous paragneisses 40 



Pyritous gneiss 42 



Quartzite and quartz-schist .... 47 



Amphibolite 50 



Post-Grenville rocks ' 54 



PAGE 



Gabbro-amphibolite ; Pierrepont 



occurrence 54 



Gabbro-amphibolite; Pyrites 



occurrence 61 



Granite gneiss 65 



Pegmatite dikes. 78 



Amphibolite inclusions 86 



Structure 93 



List of references 109 



Index Ill 



M7or-Di5-i50o 



ALBANY 



THE UNIVERSITY OF THE STATE OF NEW YORK 

 1916 



