ABSTRACTS 95 



deposits are secondary and of recent age. The southern deposit was 

 formed in a shallow gulf cut off from the Permian sea at a later period 

 not far from the close. Salt appears to have been deposited with the 

 gypsum, but now it is only found farther out in the old gulf where it 

 was thicker. 



The Cofficii Glacier, Greenland. By Ralph S. Tarr. 



In this paper attention is called to the recently published conclu- 

 sions of Professors Salisbury and Chamberlin that glaciation on the 

 Greenland coast has not in recent times extended much further than 

 the present ice margin. The evidence upon which this is based is 

 stated, and it is pointed out that another interpretation of the rugged 

 topography of the high parts of the Greenland coast is possible. This 

 is, briefly, that the peaks seen from a passing vessel present the face 

 which is least likely to be glaciated ; also that they have been longer 

 exposed to denudation, both preglacial and postglacial, and that, 

 being higher than the surrounding land, they were more rugged before 

 the ice came, and reaching up into the glacier they were less scoured 

 by the ice than is the case with the lower lands. 



The description of the geological conditions and evidence of 

 glaciation upon the Upper Nugsuak peninsula (latitude 74° 10'- 15') 

 follows, and it is pointed out that the higher points in this region 

 have all been covered by ice notwithstanding the fact that, as seen 

 from the sea, the topography of the peaks is as rugged as that of other 

 parts of the Greenland coast. Small beds of till and numerous trans- 

 ported pebbles, whose origin is somewhere within the ice-sheet, are 

 found on the highest points. The Devil's Thumb, rising 2650 feet 

 above the sea, has been glaciated ; Wilcox, 1400 feet high, and twenty- 

 five miles from the margin of the ice, has also been ice covered, and 

 the glacier has extended over the Duck Islands, which are eight or ten 

 miles further to sea than this. Adding to the land height the depth 

 of the water in the neighboring bays, it is certain that at the Devil's 

 Thumb the ice-sheet was not less than 3000 feet thick ; that at Wilcox 

 Head, twenty to twenty-five miles from the present ice margin, there 

 was glaciation to a depth of certainly not less than 2000 feet, and that 

 at the Duck Islands, thirty or thirty-five miles from the present glacier, 

 the ice-sheet had a depth of not less than 600 feet. In other words, in 

 this part of the Greenland coast all the land now visible has been 

 recently glaciated, and so far as evidence here is concerned, there is no 



