62 UNIVERSITY OF COLORADO STUDIES 



place and made accurate measurements, ascertaining that No. i 

 had moved II. 15 feet; No. 2, 11 .9 feet; No. 3, 13 feet; No. 4, 15.9 

 feet; No. 5, 16.75 feet; No. 6, 18.5 feet; No. 7, 20.6 feet; No. 8, 

 20.45 feet; No. g, 21.7 feet; No. 10, 27.7 feet. 



The main body of the glacier covers an area of somewhat more 

 than one-half a square mile. This does not include the southern lobe, 

 which is now almost separated from the northern by a moraine and 

 is quite distinct in its origin. The southern lobe is now practically 

 dead, though it still shows a distinct bergschrund in the upper part. 



As is the case with all glaciers and neve remnants in the Southern 

 Rockies, the present size of the glacier represents but a small fraction 

 of its former extent and depth. 



Nearly all glaciers everywhere are now shrinking. Arapahoe is 

 no exception. Covering a small portion of the foot of the ice and 

 dammed back by a portion of the moraine is a small lakelet, showing 

 recent recession of the ice from that part of the moraine. This lake 

 was present eleven years ago, but has steadily enlarged. When first 

 observed and long afterward, it contained clear water from the sur- 

 face of the ice, showing that compact ice still covered the bottom and 

 prevented the mingling of silt-laden water from beneath with the 

 clear water which formed the lake. In 1910 the water had become 

 almost milky white and rocks which had projected considerably 

 above the surface of the water, apparently resting upon the underly- 

 ing ice, up to 1906, have now entirely disappeared, probably owing to 

 the melting of the ice from beneath them. Since the survey of 1902, 

 two incipient valleys which then existed in the ice, one west of the 

 center of the ice-tongue, and one east of the lake, have deepened 

 perhaps twenty feet or more and become very pronounced valleys, 

 with steep sides. At the same time the center of the ice-tongue itself 

 has shrunken away over ten feet down the moraine, and along the 

 lateral moraine on the northeast side the shrinkage has been over 

 twenty feet. The ice within the moraine, noted by Fenneman, has 

 much of it since melted out. The smaller prongs at the head of the 

 main glacier and along the sides of the neve have scarcely changed in 

 either shape or size since the original survey, as is demonstrated by 



