252 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



coi-responding strata east and west of the river still resemble each other 

 closely. Farther south the beds revert to the types prevalent in the north- 

 ern part of the State, but with many minor peculiarities, and still the resem- 

 blance is close, bed for bed, between those on the east and those on the 

 west of the river. 



THE PASSAGE EASTWARD INTO THE BRIMFIELD FIBROLITE-SCHIST. 



On the north <»f Warwick the Conway schists agree exactly with those 

 in the Northfield syncline next west, and thus with the type west of the 

 river. As the beds are traced south along the strike they gradually become 

 fibrolitic, and the same change takes place slowly across the strike as one 

 goes eastward into higher beds. 



Because of the abundance of granite, metamorphism is more pro- 

 nounced in the central part of the State, and here fibrolite occurs in the 

 schists all the way to the Connecticut. Again, where the nontibrolitic 

 Conway schist passes out over the Belchertown tonalite it becomes most 

 coarsely fibrolitic. Finally, as the beds are followed still farther east 

 across Worcester County the great increase of granite promotes a corre- 

 sponding increase of fibrolite in the highly aluminous Conway schists, and 

 they are named for convenience the Brimtield schists. 



