158 LEWIS G. WESTGATE AND E. B. BRANSON 
except small details the region has remained otherwise unchanged; 
so that at the time of the last glacial advance it was essentially as 
it is today. 
The later moraines occur in close association with the present 
valley of Bull Lake Creek, either as terminal moraines below Bull 
Lake, or as small recessional moraines up valley. The earlier 
moraine, however, shows (Fig. 9) a very different relation to the 
present valley. At the base of the mountains it is 100 to 200 feet 
thick, with a typical morainic topography, and its mass of bowlders 
lies on inclined Mesozoic rocks several hundred feet above the 
floor of the valley. It was laid down in reference to a much 
shallower valley (probable restoration shown in Fig. 9), and the ex- 
tension of the drift to the north suggests that near the Wind River 
Fic. 9.—Section (diagrammatic) to show the position of the early moraine to the 
earlier (ABC) and present valley (ABD) of Bull Lake Creek. 
the present stream departs from the course of the earlier stream. 
The cutting of the present Bull Lake Creek, to a depth near the 
mountain of some 800 feet, is the work of interglacial time. 
The earlier drift is known to be older also because of its more 
weathered and eroded character, and because of its relations to 
certain terraces. The earlier moraine rests upon a terrace frag- 
ment (Fig. 8, L). Fragments of this terrace are found at a corre- 
sponding level across the Wind River. This terrace rises toward 
the range and is overridden by the moraine. It is therefore pre- 
early glacial. The valley A—A existed before the last glacial time, 
since the outwash gravels of the last ice advance run into it. The 
cutting of the broad valley below the restored Z—L, which is floored 
by the terrace V-N, is also the work of interglacial time, and was 
done at the same time that Bull Lake Creek was deepening its 
earlier valley. The broad terrace L-L, reaching back toward the 
range, is one of the later terraces of the Wind River region, either 
No. 1 or later, but it was cut before the earlier glaciation. It 
