220 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



The rock here is a coarse, very rusty, garnetiferous and feldspathic 

 mica-schist. It is surrounded by granite, and floats, as it were, in it, and is 

 largely injected with granite veins, which at times so greatly predominate 

 that one must describe the area as occupied by granite containing parallel 

 filaments and thin sheets of schist. The latter do, nevertheless, preserve the 

 dip and strike of the main mass, while the granite has also its constant rude 

 dip and strike in the same sense as if the process had here been carried a 

 step farther, and the granite, being injected into and opening out the laminte 

 of the schists and cooling- between them, had retained a lamination from 

 them after they had been wholly or almost Avholly absorbed into its mass. 



The schists agree .so closely with the Conway mica-schist where it 

 comes into the granitic areas on the west of the river, directly op))osite, that 

 I have no hesitation in following the stratigraphical indications and associat- 

 ing them together. 



LEVERETT CENTER. 



Southwest of the great mass of granite another long .strip of the rocks 

 of the series runs from A. Field's, on the road east of Mount Toby, southeast 

 through Leverett Center and South Leverett and on into Shutesbury, to 

 end in Mount Boreas at Adams Mills. 



Just above Leverett Center the gneiss is notched into it by a series of 

 faults. The amphibolite runs down the eastern border of the strip. It is 

 for the most part a tliin-fissile rock, often stretched and ligniform, of dark- 

 green color, made up of magnetite, feldspar, and hornlilende, the latter in 

 elongate needles, and all parallel to one another and to the line of stretching. 

 It is at times, as south of A. Field's, a tremolite-schist. The mineral is in 

 short, stout prisms, without feldspar, quartz, or ore. Rarel}" the lower inica- 

 schist (c) appears between it and the gneiss, but the whole series is in the 

 greatest confusion and is also largely covered by till and sand. 



THE SAVOY SCHIST, OR WHETSTONE-SCHIST. 



The center, and by far the larger portion of tlie series, is taken up by 

 an' arenaceous rock, slightly micaceous, and at times slightly hornblendic, 

 which is at times cru.shed to pieces and jointed and cut by many quartz 

 and specular iron veins, the rock itself being thoroughly silicified and ren- 

 dered compact and hornstone-like. It is often exactly like the corresponding 



