SILURIAN SCHISTS. 



217 



TlIK WKXDKLI. IMIAXf'II SVXCT^INE. 



In the southwest corner of Warwick, at Harris's pond, a subordinate 

 synchne branches off from the great central syncHne next to l)e describeil. 

 It is directed first west, bends round south in Barber's liill, in which it 

 passes tlu-ough a corner of Erving, and crosses the river and extends south 

 into Wendell, where it ends abruptly against a fault. 



At the point where it branches, west of Barber's pond, the uppermost 

 bed in the syncliue is a dark, graphitic mica-schist (Conway) with abundant 

 transverse biotite and with many staurolites and small garnets. It is thus 

 exactly like the corresponding uppermost beds (/) in the Northfield syncline 

 already described, and so forms an important link in the chain of evidence 

 in favor of the identity <jf the series I am here describing. with the similar 

 series across the Connecticut Valley, with which I have associated it. 



There is a fine section of the beds of this series exposed in the railroad 



Contvay Sc/i/Sf. 



Fig, 13.— Section on railroad east of Erving station. 



cutting east of Erving and opposite the piano factory (fig. 13), though the 

 beds are tlu-own into such confusion that no conclusions can be drawn con- 

 cerning their sequence. ' 



Enteiing the cutting from the west, several large (jutcrops of amphibo- 

 lite appear through the sands, and just beyond is a great boss of granite 

 curiouslv molded together with aniphibolite, which is changed to biotite- 

 schist at its ccintact with tlu^ granite, which carries upon its back a great mass 

 of a grav whetstone-schist extremely contorted. This is followed by a 

 great body of amphibolite, in places much contorted. It contains al'oite 

 and calcite in veins, and nodules of epidote often 1.5'^'" long. To the east 

 this is followed by a coarse, gray mica-schist with garnets (ao 0) and small 

 staiirolites. 



All these beds resemble closely the corres|)onding ones of the North- 

 field section, which ends just north of this point, and this serves to connect 

 the two and unite both with the western area. It serves also to illustrate 



