THE CONWAY SCHISTS. 199 



the granite still farther soutli, on the Westhamptou line, is another remnant 

 of the same limestone from the Conway schist which formerly mantled over 

 the granite.^ The inclusion is still ])artly micaceous limestone. 



CLEAVAGE IN THE CONWAY SCHISTS. 



In the flags, or Goshen schists, the original lamination seems to be gen- 

 erally preserved. In the Conway schists a distinction can be made between 

 the eastei'n half of the schists in the granitic area, where the impregnation 

 of granite and quartz and the great contortion leave one at times in doubt 

 as to the origin of the foliated structure, and the western or lower portion, 

 where the fine crenulation or corrugation produces a ligniform structure in 

 which strike remains distinct but dip becomes qiiite uncertain. 



Without searching far one can generally find a banding of coarser and 

 finer material — a bed of limestone or whetstone-schist — and then genei'ally 

 will find the foliation to agree with the original lamination. This is beau- 

 tifully seen at the dam in Huntington ^'illage. Standing at a distance, the 

 laminjB, from 2 to 14 inches in width (average 6 inches), are each bounded 

 by a black band at the bottom, 2 to 3 inches wide, which shades off" al)ove 

 into the lighter portion, the whole making exactly the impression of a lam- 

 inated sandstone, the lower part of each being fine-grained and clayey, the 

 upper part coarse and sandy. On inspection the lower portion is found 

 to be dark from the abundance of garnet, biotite, staurolite, and cvanite, 

 while the light portion is sandy and contains only scattered garnets. 



What seemed at a distance to be true was doubtless once tiiie, and the 

 lower portion of each layer, being argillaceous, has given rise to the alumi- 

 nous minerals wanting in the sandy jjortion of the layer. A part of the 

 dark color also depends upon the fact that the new-formed minerals have 

 often inclosed much coaly matter that might otherwise have been carried off". 



At other places precisely the same structure enables one to detect a 

 well-developed cleavage. This is the case along the western of the two 

 roads going south from Chesterfeld Center, and on the east-west road a 

 mile south of the village. 



This is finely illustrated also along the east side of the road going south 

 from Stevens's mills, in Worthington, in a field abounding in most beau- 

 tiful roches moutonndes. The rock is a dark, comigated mica-schist. The 



'See "Argentine" in Mineralogical Lexicon: Bull. U. S. Geol. Survey No. 126, 1895, p. 43. 



