34 NEW YORK STATE MUSEUM 



vary notably, but the amphibolite is usually subordinate. Along 

 the state road most of the rock is quartzitic with relatively fewer 

 garnets. 



Rocks very similar to those just described constitute the main 

 bulk of the Mount Anthony area of Grenville-gabbro-granite mixed 

 rocks. Granite to grano-syenite is always abundant in these banded 

 rocks, while the Grenville (usually garnetiferous) and metagabbro 

 locally vary notably in quantity. 



Gabbro-granite Mixed Rocks 



Several small areas of mixed rocks of this sort are shown on the 

 accompanying geologic map. In general it may be said that they 

 represent gabbro (or metagabbro) which has been more or less 

 intimately cut to pieces by granite and pegmatitic granite with some 

 local suggestions of admixed Grenville. In some cases granite pre- 

 dominates and in others gabbro. 



In the area south of Mount Anthony many small pegmatite dikes 

 cut the mixed rocks at various angles, though mostly parallel to the 

 foliation, and these pegmatites commonly carry considerable mag- 

 netite in masses up to an inch or two across as well shown at the 

 old iron mine (see map). It is believed that this magnetite was 

 absorbed from the old gabbro by the pegmatitic granite during its 

 intrusion. 



Great ledges in the eastern part of the area 1^2 miles northwest 

 of Corinth consist of amphibolite (metagabbro) rather thoroughly 

 cut, injected and digested by granite with many very narrow bands, 

 of pegmatite lying parallel to the foliation. 



Several exposures in the area 2 miles north of Hadley show the 

 rock to be mainly metagabbro (amphibolite) intricately cut and 

 injected by granite and pegmatitic granite causing the mixed rocks 

 to have a banded appearance, in some cases almost contorted, as 

 along the northeast side of the mapped body of gabbro. 



The areas in the northwestern corner of the quadrangle consist 

 mainly of granite varying to grano-syenite, the composition of 

 which has in many places been changed by more or less complete 

 digestion of bands of amphibolite parallel to the foliation. That 

 this amphibolite is metagabbro is strongly suggested by some bands 

 which have been relatively little affected by the granite. A thin 

 section from a lens of the amphibolite which has been highly in- 

 jected and more or less digested by the grano-syenite magma 



