THE CHESTER AMPHIBOLITE AND SERPENTINES. 7y 



of steatite alone. These lenticiilar masses liave eaten their way into the 

 aniphibolite for various (listances, and it is sugo-estive that thev always 

 appear aloiiy the upper surface of the amphibolite, or on the upper sui-face 

 of separate l)aii(ls where, as is often the ease, the latter rock does not occupy 

 the whole space assig-ued to it on the map, hut has intercahited suhonlinate 

 layers of sericite-schist. 



The Chester emery bed occupies the same position along the eastern 

 border of the amphibolite. The character of the serjientine bands which 

 accompany the amphibolite changes in Blandford. At ()sborn's cjuarrv is 

 a bed of sahlite-serpentine, one of olivine-serpentine, and the hrst of a 

 series of enstatite-serpentines, which, as the bed is followed, becomes of 

 greater relative importance and gradually almost replaces the amphibolite 

 and is itself at last almost replaced by coarse doloniitic limestone. 



The baud is in its wdiole extent conformable with the sei-icite-schi.sts 

 and runs across the country with dip varying very little from DO" and in 

 strike conforming to the winding of the schists. 



FRANKLIN COUNTV. 

 THE ROWE SERPENTINi:. 



In the northern portion of the State the band enters the town of Rowe 

 from Vermont, exactly at its northeast corner, and extends soutln\est across 

 the town as a heavy l^ed, 10 to 20 rods wide, of a black, thick-liedded, epidotic 

 amphibolite. It seems to be continued far north to the imjiortant actinolite 

 bed at Newfaue. It is well exposed at the bottom of the hill south of the 

 house of J. Streeter, jr., and runs about a mile west of Rowe Center, where, 

 40 rods northeast of A. C. Bliss's, it can-ies on its east border a heavv l)ed of 

 steatite (bed No. 1'), which is very hard and chloritic. From tliis point it 

 takes the same curve as the Deerfeld River to the west, and forms the crest 

 of a ridge until, at J. C. Cressy's, it crosses the road running down to Hoosac 

 Tunnel. It is here 30 rods wade, is ver}- fine-grained, l)lack schist in its 

 western j^ortion, and on the east is an epidotic quartz-hornbleude-schist, 

 and there are one or two other bands a few rods east in the hydromica- 

 schist. It continues down the lull, and where it cuts across a sharp bend 

 in the road it changes suddenly almost entirely into serpentine and steatite 

 (bed No. 2), only 7 feet of the amphibolite remaining on the western border. 



' For convenience of reference I have numbered the beds of steatite and serpentine described in 

 this section. 



