1883. 27 Tra7is. N. V. Ac. Sci. 



groups of shallow basins. The depth of these varies from a half an 

 inch to 3 inches, sometimes reaching 15 inches, and their diameter 

 from a few inches up to 3 or four feet. In the bottom of these basins 

 lie many pebbles, partly those which have been loosened from the 

 conglomerate, and partly less rounded chips which have been flaked 

 up from the bottom, apparently by the action of frost. 



So hard is the rock that it is rare to find any deep grooves. The 

 scratches are mostly very shallow, rarely i or ^ inch in depth, though 

 often very numerous, long, and parallel. Very shallow and broad 

 troughs, a half to one inch in depth, and several inches in width, gen- 

 erally occupy the polished areas and produce a gently undulating 

 surface. 



The direction of the striae varies a few degrees on either side of 

 northeast, as shown by the following observations noted : 

 S. 35° W. 

 S. 29° W. — abundant, very long, one-sixteenth of an inch in depth, 



counting 1 5 to a foot. 

 S. 41° W. 



S. 46° W.— abundant. 

 S. 47° W. 



s. 55° w. 



and a few. i inch in depth, S. 75° W. and S. 86° W. In following a 

 long scratch southward, there seemed to be a tendency to curve more 

 and more toward a point nearer the west. 



The gap immediately below the Point is occupied by great rounded 

 heaps and even hills of coarse till, made up of angular blocks of the 

 conglomerate and sandstone. In a lower gap further to the southward, 

 crossed by the road to the Point, a finer drift occurs, which was appa- 

 rently not stratified, but, where cut by ravines running down to the 

 westward, presented a series of 3 or 4 well-marked terraces. The in- 

 terest attached to these observations depends on the fact of the high 

 altitude of ^hese till deposits, probably 1,000 feet above the sea, and 

 far above the reach of the floods of the Champlain period. I had not 

 the time nor opportunity to give them the thorough study necessary 

 to unravel their true meaning. 



I am indebted to Mr. John H. Caswell, of New York, for the follow- 

 ing notes which he kindly made on the glacial striae, near the north- 

 ern end of the Shawangunk range, at and near Lakes Mohonk and 

 Minnewaska. At this point, the trend of the range is from a little 

 west of north to a little east of south. Lake Mohonk seems to occupy 

 an irregular cleft with precipitous walls, and the horizontal surfaces 

 of conglomerate adjacent to the lake are beautifully polished and stri- 

 ated in many places. Lake Minnewaska lies on the top of the range, 



