FOLDED BETWEEN NON-FOLDED STRATA 



429 



but its base occurs well down in their zone A^ or about sixty-five to 

 seventy feet below the top of the Trenton Hmestone. This con- 

 torted zone is about eight or ten feet thick and is well shown along the 

 path opposite High Fall. From this point it may be traced along the 

 sides of the gorge for nearly two miles to near the village of Prospect. 

 Within the folded zones the layers are, in rare instances, scarcely 

 disturbed; sometimes they are only gently folded; most commonly 

 they are highly twisted or contorted; while occasionally some of the 

 layers are broken and pushed or faulted over others. 



Fig. I. — Sketch showing highly folded and broken limestone layers between 

 undisturbed beds as seen along the foot-path opposite the top of High Fall, Trenton 

 Falls, N. Y. Scale: one inch = six feet. 



B 



In those places where the folding has not been carried to an extreme, 

 numerous observations show the axes of the folds to run generally 

 from N. 50° E. to N. 65° E. The strike of these minor folds cor- 

 responds closely to the strike of a fault which the writer has found to 

 extend from Prospect village past the village of Trenton. Also the 

 whole Trenton Hmestone formation has, in this vicinity, been thrown 

 into a number of very low folds which show about the same strike 

 as above given. 



It should be noted that these highly folded layers occur only in a 



