94 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



to rich dark oil-green precious sei-pentine. The surfaces show at times 

 naiTow bands and squares of serpentine with centers of straw-yellow and 

 borders of oil-green color, which form an attractive verd antique, plainly 

 the last identifiable stage of the flattened-out enstatites that the rock 

 formerly contained. It is further clear that this central portion never 

 contained so much enstatite as the border beds. 



The country rock to the west is a coarse muscovite-biotite-schist, with 

 few garnets and a great abundance of coarse-bladed gray cyanite, which 

 stands out in reticulated surfaces on the weathered slabs and will furnish 

 interesting cabinet specimens. They can be obtained in abundance by 

 following the path along the serpentine bed south to the first wood road 

 and then going up west along the wood road to a prominent ledge on the 

 south of the road. 



Here also the foliation faces of the coarse schist contain rounded and 

 flattened disks, 1 to IJ inches long, which suggest pebbles. Rarely one 

 can be seen by its cleavage to be in part feldspar, but most are a quartz- 

 biotite mixture. Also, to the west of the south opening made by the com- 

 pany, which is reached by going up a wood road from a miner's shanty, the 

 schist shows rounded and somewhat oval, white sm-face forms, which strongly 

 suggest the trace of pebbles, but they are not distinguishable in the midst 

 of the coarse schist when it is freshly broken. The rocks stand vertical, 

 but I suppose these western schists to be older than the serpentine. The 

 cyanite follows the serpentine and amphibolite for many miles across 

 Granville, and in Barkhamsted, Connecticut, furnishes the finest cabinet 

 specimens. 



The cyanite-schists are succeeded from west to east by the following beds: 



Section at the mam mine. 



Feet. 



1. Black enstatite-serpentine 60 



2. Green laminated crystalline limestone 48 



3. Wliite actinolitic marble 3 



i. Black mottled marble ". 30 



5. Tremolitic soapstone 8 



6. Coarse muscovite granite 8 



The eastern country rock is not here exposed, as the high teiTace 

 gravels cover the area to the east. It is a schist like that on the west, but 

 without cyanite. A band of rich-green actinolite three-fourths of an inch 

 wide runs across both of the principal bands of the quaiTy. 



