376 DARTON — GREEN POND, N. J., TO SKUNNEMUNK MT., N. Y. 



V ward is estimated by Merrill to be 50 feet, but owing to lack of continuous 

 outcrop across the formation I could not verif}^ this. 



North from Newfoundland no clear exposures were found, and the 

 formation appears to finally thin out under the drift on the western slope 

 of Kanouse mountain. It comes out again along the west shore of the 

 southern end of Greenwood lake, where it attains considerable promi- 

 nence in an anticlinal rido;e, as shown in section VII, plate 17. In the 

 southern end of the ridge there is a synclinal of Monroe shales, and the 

 Oriskany appears along its base, but farther north for some distance it 

 constitutes the crest of the ridge along the lake shore and comes up again 

 in a long, rocky island in. the lake. North of this island it constitutes a 

 small point three-quarters of a mile south of 'the state line, where it is 

 overthrust on the Monroe shales. The rock in this region is a white, 

 - — - light gray or buff quartzite, containing much coarse sand and more or 

 less quartz pebbles. A few indistinct casts of fossils were observed near 

 the southern end of the area, but they do not appear to be determinable. 

 As the overlying shales contain abundant lower Hamilton fossils and 

 Helderberg fossils were discovered in a thin streak of underlying lime- 

 stone, I have no doubt as to the approximate Oriskany age of the quartzite. 

 The thickness here is about 28 feet. This area, together with the adjoin- 

 ing belt of Green Pond conglomerate and quartzite, were shown by Cook 

 on the map in the Geology of New Jerse}^, 1868, and mentioned in the 

 text as Oneida. 



In a knoll just north of the northern end of Greenwood lake there is a 

 small exposure -of quartzite, with coarse sand grains and occasional peb- 

 bles, Avhich I believe to be Oriskany. It dips conformably under the 

 Monroe black shales, but is not exposed in contact with them. It is 

 shown in section VI, plate 17. The valley north of this knoll is heavily 

 drift-covered and the extent of the quartzite could not be ascertained. 



On the west side of Bellvale and Skunnemunk mountains there are a 

 number of exposures of the quartzite, some of which have considerable 

 prominence. The first one from the south is shown on section V, plate 

 17. It is a mass about 200 feet in length, lying on the east slope of a 

 ridge of Hudson shale. It is abruptly terminated by a cliff southward 

 and appears to thin out to the northw^ard. It dips gently to the east 

 and passes conformably under fossiliferous Monroe shales. It is a hard, 

 white quartzite, containing an occasional white quartz pebble and more 

 or less coarse quartz sand. Thirty feet are exposed. No fossils were 

 found. Half a mile north there is another mass of the rock, similarly 

 related in structure to Hudson shales on the west, and Monroe shales to 

 the east. It extends for about a mile, and the glistening white rocks in 

 its steep eastern front render it a conspicuous feature. It contains local 



