34 



NEW YORK STATE MUSEUM 



The hill is composed altogether of blocks and cobbles of the 

 Potsdam sandstone. On the wave-heaped crest and the western 

 landward slope the blocks are still prevailingly angular, and 

 there are no signs of strong water action other than the bare flat 

 rocks. But from the crest down the eastern wave-washed slope 

 the blocks are often well rounded, and are particularly so at 

 lower levels. The fragments decrease in size from the crest, and 

 near the 600 foot level are coarse gravels. The larger blocks are 

 between 3 and 4 feet in length, but blocks yet larger occur. Ovoid 

 masses of this size in the upper zones of beach action attest the 

 strength of the waves which reshaped this side of the hill. 



The eastern slope exhibits a number of benches of these 

 boulderets and cobbles arranged in the manner peculiar to 

 regressive wave action. The crest, tolerably uniform in elevation, 

 is a narrow ridge, about the northern and southern ends of which 

 the cobbles of the shelf next below are extended in well formed 

 recurved hooks. 



The third level below the crest extends northward along the 

 slope of the ridge, which is there low T er and, like the continuation 

 of the beach on the second level, loses its beach aspect near the 

 northern end of the hill. 



I Avas not able to identify any signs of this wave action at 

 similar levels on the equally strong morainal ridge just north and 

 west of the hill. 



The southern end of Cobblestone hill falls off to a lower level 

 with signs of wave action along the crest of this extension, and 

 about halfway down its eastern slope. Below 600 feet the sur- 

 face of the main ridge is heavily covered with coarse gravelly 

 deposits forming an even slope characteristic of the zone just 

 below strong wave action. 



In a subsequent report it is planned to give a sketch map and 

 more detailed account of this deposit. 



Neither north nor south of Cobblestone hill, within the zone of 

 abandoned beaches to which this group of strand lines belongs, 

 are there indications of such strong and long continued wave 

 action. The extreme localization of the effects has seemed to me 

 possibly explicable on the view advanced on a previous page, viz, 

 that the ice front for some time stood near this hill on the north. 



