162 WILLIAM J. MILLER 
the stock or dike 14 miles southeast of Chestertown which has 
several such tongues, one of them from 1 to 6 inches wide clearly 
cutting the granite porphyry for 30 feet. However, it is a strik- 
ing fact, that, in spite of many excellent contacts which were 
F775 ro | 
a UMAR BS GSN Zz 
a AOS TN 
Frc. 1.—Geologic map of part of the North Creek, New York, quadrangle, show- 
ing the relation of the gabbro stocks to the other pre-Cambrian rocks. 
Gv.=Grenville series; Sg.=Syenite and granite gneisses; Gsg.=Grenville- 
syenite-granite mixed gneisses; G.=Gabbro; and D.=Diabase. Heavy black 
lines=faults. Contour interval=1oo feet. 
