12 NEW YORK STATE MUSEUM 



where it is lost on the bare, flat rock, is a pile of blocks mainly of 

 Potsdam sandstone, forming one of the most striking and singular 

 glacial deposits of the northern Adirondack region [pi. 13, show- 

 ing a photographic view of the eastern, wave-washed slope of the 

 moraine taken near the road over the hill]. 



Between Deer pond and Cannon Corners, from the north and 

 south road going up the hill on the west to 800 feet in eleva- 

 tion, the slope is encumbered by a peculiar deposit which in many 

 respects suggests strong water action as having shaped the gravels 

 and cobblestones, but the unstratified masses higher up show that 

 the ice sheet was concerned in the final distribution of the 

 material. 



The deposit lies immediately east of one of the large, barren 

 rock tracts locally known as Blackman's rock, the interpretation 

 of which is discussed below under the head of Spillways. The 

 deposit probably marks the j^e margin. Certainly, a little to the 

 northwest in the valley of the English river and beyond the limits 

 of the map, there is a well defined, low, bouldery moraine made 

 by the ice sheet moving southwestwardly against ' the ground 

 which here rises to the west. Stafford's rock, another spillway, 

 extends northward from this deposit towards " the Gulf," a ravine 

 near the boundary line, on the southern side of which heavy boul- 

 der deposits again appear. 



In fact, the whole northern slope of the Adirondacks within 

 the limits of this map and along the western bordering area is 

 marked by deposits showing the retreat of the ice sheet. Almost 

 everywhere from an elevation of 900 feet down to 700 feet there 

 are m a iked signs of the interaction of powerful streams of water 

 (lowing along the ice margin, sweeping bare large tracts of rock 

 and depositing bars and ridges of coarse cobbly drift, now in 

 the open path of the torrent, now against the ice itself. The 

 result is that the discrimination of rudely assorted, stream-trans- 

 ported blocks of the Potsdam sandstone from accumulations of 

 similar material dumped at the ice margin or pressed by the ice 

 info low ridges is often difficult and perhaps impossible. 



Other small and apparently disconnected patches of frontal 

 moraine habit appear at Wood Falls and in the low country 

 north of Mooers Junction, between the elevations of 300 feet and 



