National Geographic : 1894 Mar 17
N. H. Darton-ShawangunkMountain. A few were observed somewhat more to the westward in direc tion, one-fourth inch in depth. In the vicinity of lake Mohonk, about the hotel and on the northwestern slope, south 10° west is the general direction; on the southeastern side of the mountain and on the road to Alliger ville, it is south 400 east; and at Sky Top, south 18° east. At lake Minnewaska the trend is south 10° west. There is but little foreign glacial drift on the summit of the range, so far as ob served, but there is considerable in the adjoining valleys. The origin and history of the lakes are not entirely clear, but they appear to be due to glacial agencies. The principal feature has been a local deepening and widening of a preexistent valley, aided, at least in the case of lake Mohonk, by the presence of shales at the point now occupied by the lake. They do not ap pear to be due in great measure to damming by glacial or other debris or to dislocation. Owing to its prominence the mountain has been long exposed to erosion. Originally the grit was overlain by a great mass of limestones and shales and the rocks of the Catskills, but these were removed far down into the Rondout valley at an early period. During the glacial epoch there was great erosion and the removal of great masses of the grit, which is now found in drift far to the southward. To the glaciation, too, probably is due the abruptness of Paltz point and other features of that sort. The grit also originally extended far to the eastward, but, owing to long-continued undermining by the removal of the soft, under lying shales, its front has receded to its present position. This recession is still actively in progress, and every year there fall great masses from the front of the mountain. One of the regions of weakness is Paltz point, for its base is exposed to erosion, on several sides, and it will eventually disappear. Probably before it is gone the streams heading near its southern end will cut back through the shales at the head of lake Mohonk, and this beautiful body of water will be tapped. Of course this is all very remote, so far as human history goes, and artificial means will stay its progress in some measure, but it will all be accom plished in the near future, geologically speaking. Lakes Minne waska and ,Awosting lie so far back from the front of the moun tain that they will survive lake Mohonk by a very long time.
1894 Apr 25
1894 Feb 14