The medial Moraines. 33 



across the ice converging toward the inlet. Many of them rise 

 30 or 40 feet above the general level of the ice ; but near the 

 glacier's mouth they have become so diffused or have lost so 

 much of their material in crevasses that they do not affect the 

 general surface. In fact, the moraines which cross the crevassed 

 region near the end of the glacier have almost entirely disap- 

 peared. It is only from an elevated point that they can be traced. 



The moraines from the east are large and much massed together. 

 A large moraine from the eastern side of the southeastern tribu- 

 tary curves around and entirely closes in the end of that glacier 

 and unites with several moraines from its western side into a 

 confused mass, which the time at our disposal did not permit us 

 to separate. Am.ong these moraines occurs the marble mentioned 

 by Professor Wright. The moraines from White glacier unite 

 with those just mentioned a short distance below its mouth, 

 beyond which they approach closer and closer to the mountains. 

 They look like huge earthworks holding up the clean ice of this 

 tributary 20 or 30 feet above the general surface of the glacier. 

 Dirt glacier is completely closed in by a moraine across its mouth. 

 Above this comes a zone of comparatively clean ice, and then for 

 a mile or more the glacier is so completely covered by debris that 

 no ice can be seen. Girdled glacier also is completely hennried 

 in by a moraine. 



The next group of moraines, coming from Main valle}^ and 

 Granite canyon (see plate 10), unite near /, where the}^ are ap- 

 parently reinforced, and finally flow down the steep slope east of 

 the ice-front. These moraines are quite different from any I 

 have ever seen or read of. They have two ends, but no begin- 

 ning. From the region lying between Tree mountain and Granite 

 canyon the ice slopes in both directions toward the glacier's 

 mouth and into Main valley. The former slope, as has been 

 said, is a little over 1° ; the latter is two or three times as much. 

 Tw^o of the moraines have their upper terminations in Berg lake ; 

 a third ends in Main lake. To this group belongs also a moraine 

 which issues from Granite canyon, flows around Girdled glacier, 

 and ends against the side of the mountain a short distance clown 

 Main valley, or follows the mountain side to Berg lake. 

 Another moraine, issuing from Granite canyon, curves as though 

 about to flow into Main valley and then abruptly changes 

 its direction and flows to Muir inlet (see plate 11). 



A large moraine stretches from nunatak // to the corner of the 



