626 ALLEN DAVID HOLE 
nearly a quarter of a mile in length is found at about 11,500 feet in 
elevation (Figs. 9, 10,and tr). Talus slopes on all sides, and high, 
steep, rock walls to the southeast form the boundary of the cirque. 
Alta basin resembles Turkey basin in its broadly open form, its 
abundant talus, and steep, high bounding walls. It differs chiefly 
in having a less level bottom, in the absence of distinct rock streams, 
and in the much smaller size of its lakes. 
Fic. to.—West edge of rock stream in Turkey basin. Elevation, 11,300 feet. 
Looking south. Note also the precipitous wall of cirque above talus slope in 
background. 
Ice from Turkey basin and Alta basin spread over the plateau to 
the west, covering an area about two miles long by one and one-half 
miles wide. In this area outside of the cirques, below about 11,000 
feet in elevation, the topography is that of ground moraine or 
terminal moraine; numerous irregular hills inclose kettles 10 to 
1s feet deep and up to 100 feet in diameter (Fig. 12, and fore- 
ground of Fig. 2). In most directions this hummocky topography 
