of the Northern Catskill Mountains. 



159 



gravels were supplied by glacial waters escaping from an ice 

 tongue pushing over the divide from the north. JMo channel 

 leading down to the delta has been identified with certainty, 

 but the stream valley up to the first road seems abnormally 

 wide and flat, and may have carried a good-sized glacial stream 

 for a short time. A morainic mass in front of the delta appears 

 to be convex down stream (eastward), an arrangement in har- 

 mony with the above explanation of the delta gravels. 



Fig. 10. 



Fig. 10. Front of Platter Kill delta. Note the sharp wave-cut terrace 

 about 30 feet below top. From a photograph. 



Fig. 11. 



Fig. 11. The Platter Kill delta as it appears from the hill to the west. 

 From a photograph. 



On the hillside south of Grand Gorge village, at about the 

 level of the delta, bared rock ledges may indicate the results 

 of wave action. 



The Platter Kill Deltas. — The largest of the deltas corre- 

 sponding in height to the Grand Gorge outlet lies at an ele- 

 vation of 1620 feet in the valley of Platter Kill about 2£ 



