234 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



with few distant films of white muscovite, which was recommended by 

 President Hitchcock as a iirestone for furnaces. 



Farther south, in Pahner (north of G Keith's), it is again a greatly 

 crumpled, white, granular quartzite with distant sericite films; and still 

 farther south, on the west flank of the high hill above Thorndike (north 

 of C. Kalliher's), it is a curious white sericite- or hydromica-schist ; broad, 

 continuous wavy sheets of pea-green hydrated mica inclose flattened, 

 nodular masses of friable quartz resembling loaf sugar. 



The band of mica-schist (/) which, starting at New Salem Center, 

 runs down the east side of Prescott, becomes gradually more fibrolitic and 

 extends across Enfield, Ware, and Palmer as a rusty, graphitic, corrugated 

 schist, generally coarse and carrying few garnets. The fibrolite remains 

 very fine and is not abiindant, and the " augen " of transparent feldspar 

 found in the next band to the east are wanting. 



THE EASTERN SYNC LINE. 



ORANGE AND ATHOL. 

 GENERAL DESCKIPTION. 



Where it branches from the broad central syncline in the northeast 

 corner of Orange and crosses the town the band of the schist forms a high 

 ridge looking down upon the granite basin of the Tully brooks on the east 

 and upon the gneiss basin of Orange Center on the west. It is a closed syn- 

 cline with a subordinate central anticline, all slightly overturned toward 

 the east. Along the western slope the western wing of the syncline is 

 abundantly exposed. The center and eastern wings are almost continuously 

 laid bare along the road which forms the boundary between Orange and 

 Athol and on its continuation toward Athol. 



The Monson gneiss, which appears low down on the western slope 

 opposite J. Worrick's, is a stretched, slightly epidotic biotite-gneiss. It is 

 subporphyritic by the development of shapeless, opaque, white feldspar 

 clumps. 



Next above is a heavy bed, occupying the whole hillside, of a rather 

 coarse porphyritic gneiss, or augen-gneiss, which over a large area is not 

 very different from the lower gneiss on superficial examination. When 

 studied carefully, however, it is found to be very different. The feldspar, 

 instead of being opaque, has a moonstone-like transparency, which con- 



