244 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



Bordering these on all sides, in a width from one-halt" inch to 2 inches, the 

 hornblende is changed into a much lighter green sahlite, plainly a contact 

 l)roduct. At the soutli outcrop a band of the pyroxene rock much wider 

 occurs, which is not in visible relation to the granite. 



The schist is in places rendered gneissoid by the intrusion of sheets 

 and small irregular aggregations of flesh-colored gi-anular feldspar, which 

 can at times be distinctly traced back into connection with the granite. 



Followed south along the road the rock becomes again a chloritic horn- 

 blende-gneiss, and just beyond and east of its soutliern outcrop appears a 

 band of quartzite and mica-schist, which is exposed in the cuts of the two 

 railroads and seems to overlie the hornblendic rock, as indicated in the 

 section and described below. (See fig. 14.) 



In the roadside 165 feet below J. Squire's and in the cuttings of both 

 the railroads above (east of) his house occurs a flat, thin-fissile, feldspathic 



Fio. 14 — Section of schists west of Belchertowii . A/np/t/'6oAre' 



mica-schist of dark greenish-gray color and so full of small cubes of pyrite 

 tliat it is deeply decomposed. Dikes of coarse pegmatite from 1 to 25 feet 

 wide cut through it, and they also contain pyrite and are kaolinized to 

 great depth. The mica-schist is 10 feet thick. 



Below this is a thin-bedded, light-gray quartzite, slightly biotitic on 

 cleavftge faces. It is much fissured, and filled with combs of quartz, films 

 of hematite, and calcite, and slickensided. Below this, on the west side of 

 the road, is a massive, crumbling amphibolite, which seems to underlie the 

 quartzite. The section is here sufficiently undisturbed to show the amphib- 

 olite in normal relation to the upper beds. 



Along the road farther south, in the field east of T. S. Haskel's, is 

 an outcrop of a coarse sahlite-amphibolite, like that at Kelleys Crossing, 

 which joins Monson gneiss on the east and is cut off" by a great granite 

 vein upon the south. It is still coarser than that farther north, and the 

 pyroxene crystals are larger. It furnished the material for the microscopical 

 description of the rock below. It is a massive, friable, granular mass of 



