28 N. H. Darton—Shawangunk Mountain. 
anticlinal which rises at Rosendale. The structure of lake Mo- 
honk is shown in figure 1. 
The lake basin is in Hudson shales, but it is bordered on 
the east and west by high cliffs of Shawangunk grit. To the 
south there is a gap in the front of the mountain through which 
the shales extend to the lake. The top of these shales is a few 
feet above the surface of the lake at its southeastern end, but 
the pitch carries them a few feet below the water surface toward 
the north and west. 
On plate 2 are shown some features of lake Mohonk. 
This view is looking to the southward and out of the gap in 
the eastern front of the mountain through which the Hudson 
shales extend to the lake. On the left is Paltz point, and to the 
right, in the distance, is Cope point, a projection of the southern 
extension of the eastern front of the mountain. 
Kast of the lake there is a thick mass of grit, which hes along 
the crest of the anticlinal. It begins a short distance north- 
ward and is terminated by very abrupt cliffs in Paltz poimt, near 
the southern end of the lake. The character and relations of 
this “point” are represented in the stereogram. 
At the head of the lake and the base of the southern end of the 
mass of grit in Paltz point the Hudson shales constitute a small 
plateau which surmounts the long eastern slope of the mountain. 
There is no cross-drainage way at the base of the cliffs and the 
reason for the abrupt termination of this point is obscure. 
The erit dips gently west-northwestward along the western 
side of Paltz point and very slightly eastward in its easternmost 
part. Northeast of the lake the dip is at a low angle to the west- 
ward, but there are several slight undulations. There is every- 
where a pronounced pitch northwestward. Owing to the west- 
erly dip the grits in the Paltz point ridge are somewhat lower 
just north of the lake than elsewhere. It will be seen from these 
statements that the lake lies slightly west of the center of the 
arch of the anticlinal, and all the dips along its shores are north- 
westward, although at very lowangles. The degree of dip rapidly 
increases down the western slope of the mountain into the syn- 
clinal valley of Coxingkill. 
The outlet of lake Mohonk is to the northward by a branch 
of Coxingkill. This branch flows through a slight depression 
separating the Paltz point range from the main mountain mass, 
and then obliquely down the flank of the anticlinal, 
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