82 NEW YORK STATE MUSEUM 



Faults between Hayes mountain and Hewitt pond. West of 

 Hayes mountain, Minerva stream flows through a narrow north- 

 south valley which for 2.y 2 miles has been carved out along a dis- 

 tinct fault zone of weakness. In the bed of the stream three-fourths 

 of a mile north of the place marked " Camp " on the map, the 

 granite is considerably broken due to the faulting. -Along the 

 stream one- third and three- fourths of a mile, respectively, south of 

 " Camp," there are ledges distinctly broken or excessively jointed 

 parallel to the stream channel. In one case a crushed-rock zone 

 10 to 15 feet wide is finely exhibited. The topography suggests 

 moderate downthrow on the west. 



A ledge in the bed of the stream one-half of a mile southeast of 

 the mouth of Hewitt pond shows a distinct crush-zone with almost 

 north-south strike, but with little or no topographic influence. 



Hewitt pond brook also follows a fault zone of weakness with 

 nearly east-west strike, this being the only definite fault in the 

 quadrangle with such a strike. A few rods above the mouth of 

 the brook in a small gorge the rock is considerably broken parallel 

 to the channel. 



Wolf pond brook fault. A narrow nearly straight valley 5^2 

 miles long extends from Lester dam to north of Wolf pond. It 

 has probably been developed along a zone of excessive jointing 

 rather than along a distinct fault. In the bed of Wolf pond brook, 

 one-third of a mile from its mouth, a big ledge is considerably 

 broken by closely spaced joints parallel to the channel. 



Boreas river fault. Boreas river, for iJ/ miles after it enters 

 the map area, quite certainly follows a channel which has been cut 

 out along a fault zone or a zone of excessive jointing. One ledge 

 along the stream shows the broken rock. This fault zone is really 

 only the southern end of what is evidently a very prominent earth 

 fracture extending far into the Mount Marcy quadrangle. The 

 Ausable lakes are there located in this fault zone. The topographic 

 influence in the Mount Marcy quadrangle is very striking. 



Niagara brook fault. The long, deep, straight, narrow valley 

 occupied in part by Niagara brook has quite certainly been deter- 

 mined by a fault or joint-zone of weakness. Counting its northern 

 extension beyond the map area where its topographic influence is 

 even more pronounced, this fault or joint-zone is 6 miles long. No 

 broken-rock zone was observed within the Schroon Lake quad- 

 rangle, the bed of the brook there all being in glacial drift. 



Other faults. A big ledge at the .-road corners southeast of 

 Oliver pond is all cracked into small blocks. Also, ledges by the 



