'MM'. \Mku\h \i K CKAPB ill'. DEPOSITS 



l 2] 



Grenville Stratigraphy 



It is the hope of Adirondack geologists thai the Grenville series 

 can be "put in order." Up to the present time the succession and 



the thickness of the beds are unknown, and likewise we are 

 unacquainted with the base and the top of the series. \Y. J. Miller 1 

 has made a beginning following I. H. Ogilvie, 2 but their units are 

 far too large for our use. Most of the geologists are interested in 

 the purely scientific side of the problem, but the writer's task 

 demands that he take a practical as well as a scientific view. Hence 

 he started the field work with the hope that something could be 

 done with the stratigraphy as an aid to the problems of the graphite 

 deposits of the Adirondacks. He feels that he has, in part at least, 

 arrived at something definite. 



Composite geological column showing the Grenville stratigraphy of the 

 southern graphite area 



Rock 



Name 



Estimate 1 



thick less 



in feet 



Type locality 



Top unknown 











Beech Mountain .... 

 Bear Pond schist. . . . 



150 



30 

 70 



20 

 400 



20 



30 



60 



120 



30 



70 





Feldspar-quartz graphite schist. . . 



of Graphite 

 B";a r o")ii, Tion'ien.sja 







ternational property 





Swede Pond 



Faxon 



Dixon schist 



Hague gneiss 







erty 





erty 















Hooper property 





Sacandaga 



erty 





daga mine 



B ittom unknown 











Total 



1000 





As the number of beds recognized increased, it became necessary 

 that some name be attached to each one. The names here proposed 

 have already caused some criticism, and rightly so. Geological usage 

 demands that a name should indicate the geographical locality where 

 the formation is typically shown, and furthermore the name should 

 not be preoccupied. Such an ideal has not been realized. This is 



1 N. Y. State Mus. Bui. 170, p."io. 

 -X. Y. State Mus. Bui. 96, p. 479. 



