260 



ANNALS NEW YORK ACADEMY OF SCIENCES 



at an elevation of about 2500 feet. Aside from this narrow ridge, 

 Overlook is separated from the mountains to the north by the valley of 

 the Saw Kill. 



Structuke 



Unlike most mountains, the Catskills consist of a succession of piled 

 up, nearly horizontal strata, showing that they are really but the remains 

 of a great interior plateau now greatly eroded and dissected by water. 2 



Fig. 1. — Overlook Mountain and adjacent territory. A portion of KaatersMll Quad- 



rangle, New York 



U. S. G. S. Topographic Sheet. Reduced. Scale : 1/83332 



Except for a layer of hard conglomerate which caps many of the higher 

 peaks, the mountains consist almost entirely of alternate layers of soft 

 red shale and harder sandstone. The sandstone is sometimes thinly 

 laminated and frequently cross-bedded ; often however it shows a very even 



2 Ralph Stockman Tarr : The physical Geography of N. Y. State. New York, 1902,. 

 p. 41. 



