588 



WILLIAM J. MILLER 



Trenton Falls, New York, where the contorted beds lie at two dis- 

 tinct horizons within the Trenton limestone formation, there about 

 300 feet thick. The lower contorted zone, 4 to 6 feet thick, is visible 

 only near the crest of the lower part of High Fall and in the upper 

 end of the gorge near Prospect Village where the strata are highly 

 inclined against a thrust fault surface. The upper contorted zone, 

 5 to 15 feet thick, is well exhibited along the path opposite High 

 Fall (Fig. I, upper part) from which place it is clearly traceable in 

 the waUs of the gorge for nearly 2 miles northward to Prospect 

 (Fig. I, lower part). 



F c c r. 



Fig. I. — Upper figure: sketch of part of the upper contorted zone at Trenton 

 Falls, New York. Lower figure: north-south structure section showing the positions 

 of the contorted zones within the Trenton formation and their relation to the thrust 

 fault at Trenton Falls, New York. 



In both the undisturbed and the corrugated portions of the 

 formation the impure limestone layers average only a few inches 

 in thickness, and they are separated by thin partings of shale. 

 Within the contorted zones the strata are in some cases scarcely 

 disturbed; in some cases they are only gently folded or tilted; 

 but most commonly by far they are highly folded, contorted, and 

 even fractured. 



