390 DARTON- 



-GREEN POND, N. .L, TO SKUNNEMUNK MT., N. Y 



These mountains present steep rocky faces to the east and have rela- 

 tively gentle slopes down the dip to the west. 



Faults.— The differentiation of faulting and overlap in this region 

 has been found to be especially difficult, so that some of the relations 

 thought to be due to overlap or thinning may be the results of over- 

 thrust, and vice versa. A fault of considerable throw appears to extend 

 along the western side of the belt, and there would be difficulty in ac- 

 counting for some of the features without it. On the western side of 

 Bearfort mountain the appearance of small areas of the flags and red 

 shales underlying the Skunnemunk conglomerate is almost certainly 

 due to variations in the throw of an overthrust fault, as shown in sec- 

 tions VII and VIII, plate 17. Southward to Bowling Green mountain 

 the abrupt break between the steep slopes of crystalline rocks and the 

 Monroe shales in the valley east, and the western termination of the 

 Green Pond rocks in Bowling Green mountain are yerj probably due to 

 the continuation of this fault. The immediate proximit}^ of the fault was 



not observed, but no special fea- 

 tures of increased plication were 

 noticed in its vicinity. In Bell- 

 vale mountain and northward the 

 fault may or may not be present, 

 and the relations are probably due 

 to overlap. Near the line of sec- 

 tion V there is an exposure very 

 near the contact of Oriskany 

 quartzites and Hudson shales, in 

 which it is seen that while an 

 overthrust with low hade is possi- 

 ble, overlap is more probable. In 

 the area shown in figure 2 a dis- 

 location is suggested, but overlap 

 is more probable. 



On the east side of AVoodcock 

 hill the relations of a fault are 

 exposed, but it may be a local 

 feature entirely disconnected from 

 the possible overthrust south- 

 ward. Its relations are shown in 

 the following figure, in which the sections are at approximately regular 

 intervals for half a mile. The limestone is exposed abutting against the 

 quartzite on the south side of a small stream which flows west across 

 the southern end of Woodcock hill, and the hade is steeply to the east. 



Figure 6. — Sections illustrating the Features of a 

 Fault on the southeastern Side of Woodcock Bill, 

 Orange County, New York {looking north). 



A ^= Archean gneiss. 

 H = Hudson shales. 

 M = Monroe shales. 



C= Cambrian limestone. 

 = Oriskany quartzite. 



