THE SAVOY SCHIST. 161 



almost free from amphibolite, is flat-bedded and presents a rather monoto- 

 nous area of vertical beds, with strike varyin<>- little from the meridian. 



North of Chester tlie series occupies a position on eitlier side of the 

 line between Middlefield and Worthington, being- about half in eacli of 

 these towns, exi)Osed on the slopes of one of the most characteristic deep 

 V-shaped longitudinal valleys so common in the Berkshire Hills. 



The facies of the series has changed greatly, and starting from its base 

 at the serpentine and soapstone bed at Harold Smith's, in the north part 

 of Middlefield, which is plainly the continuation of the great bed in the 

 south of this town, instead of the interminable alternation of sericite-schist 

 and hornblende-schist beds noted above in Chester, one crosses a great 

 thickness of the vertical sericite-schists, often very quartzose, often garnetif- 

 erous, but without much hornblende until the top of the series is reached. 

 Through the whole length of the town of Worthington the conditions are 

 remarkably uniform, and the section along the road from Peru to Worthing- 

 ton Center may be given as a sample of the whole distance. 



At the cemetery, 160 feet east of the Peru line, the Becket gneiss 

 gives place to the Hoosac albitic mica-schist, coarse, corrugated, rusty, and 

 carr^'ing at times large garnets, and just before the bed of the Middle 

 Branch of the Westfield River is reached a layer 115 feet thick of a 

 bright-green, fissile chlorite-schist appears at the base of the present 

 series and replaces the usual serpentine and hornblende bed— the Chester 

 amphibolite. 



Up the sharp hillside eastwai'd, near the house of W. Starkweather, the 

 beds, as made out along the road and for a long- distance north and south, 

 are of coarsely corrugated sericite-schist, often a quartz-schist with films of 

 hydrated mica, and rarely a band of soft, deep-green, slaty chlorite-schist, 

 the whole dipping 90° and aggregating 720 feet. 



East of this house the same schists, often very quartzose, continue and 

 carry five beds of hornblende-schist, 3 to 10 feet thick. The whole series 

 is 3,280 feet thick. 



North, across Plainfield and Hawley, a great mass of barren, monot- 

 onous quartzose sericite-schists expand to a considerable width and occupy 

 the almost inaccessible hill region drained by the Cold River They 

 preserve this habit where they are deeply cut by the Deerfield River, from 

 Hoosac Tunnel to Zoar. Rarely a hornblendic bed appears near the base. 



MON XXIX 11 



