218 GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



the extreme coni])lexitv wliicli characterizes these beds in their progress 

 south tliroug'li Weiuk'H until they are cut oflt" l)y the fault east of Wendell 

 C.'entei-. 



This niav lie well studied hv goiug up the Osgood Brook road and 

 turning onto the high hill north of 8. Stevens's house. Everywhere the 

 beds are thrown into great confusion and filled with granite dikes, so tliat 

 the representation on the map, though the result of much work, gives only 

 a general vieAv of the main facts. The whole southern portion of the area 

 is undei-lain bA- whetstone-schist, which has been quarried here for scythe- 

 stones, and for this reason the hill is locally called Whetstone Hill. 



TIIK IjEVERETT-AMHERST AREA. 



THE AMPHIBOLITE AND MICA-SCHIST SERIES ALONG THE EAST SIDE OF THE 

 CONNECTICUT BASIN FROM LEVERETT SOUTHWARD. 



The bottom of the Connecticut Basin, as the area of transition between 

 the closely folded rocks with vertical dips on the west and the undulating, 

 almost horizontal gneisses on the east, is underlain by a broad band of 

 extremely disturbed rocks, faulted, soaked full of granite and (juartz Aeins, 

 and, es{)ecially along a line extending (juite across the State and situated 

 at the immediate foot of the eastern plateau, most thoroughly crushed, brec- 

 ciated, .slickensided, and filled with veins of hematite, albite, quartz, and 

 epidote, or mineral veins of the "baryta-lead formation." 



It is just along this line of maximum disturbance that a series of rocks 

 which forms a repetition of those described in Northfield (p. 212) runs 

 south from the mouth of Millers River at the great bend of the Connecticut. 



The same succession — feldspathic quartzite, or two-mica-gneiss (/>),' 

 amphibolite (rf), whetstone-schist (c), and spangled mica-schist (,/") — can be 

 made out, but with difficulty, and all the members are much altered and 

 thrown into great confusion, so that the assignments made u[)on the map, 

 though the result of long study, are given with nuich hesitation 



For convenience the amphibolite and tlie quartzose bands, the quartzite 

 below and the whetstone-schist above, are described together, while the 

 equivalent of the spangled or Conway mica-schist — the Amherst feldsitathic 

 mica-scliist — is discussed apart. 



'The italic letters «-/ refer to section given on pp. 213-214. 



