I30 C. L. DAKE 



Hewett failed, however, to call attention to the most marked 

 and interesting feature of the moraine, namely, that the bowlders 

 of which it is composed consist largely of granite, and this in spite 

 of the fact that a careful search for many miles revealed no granite 

 outcrops up the valley from the moraine. A glance at Hague's 

 map of the Crandall Quadrangle^ shows that in his mapping he 

 located no granite outcrops in Sunlight valley within the area of 

 that quadrangle, that is, in the area above the moraine. Almost as 

 striking as the dominance of the granite in the moraine is the rela- 

 tive scarcity of andesite, although not far above the moraine in 

 question the andesite walls of the basin close in, almost entirely 

 cutting out the sedimentary series. 



In view of the above-mentioned conditions the conclusion seems 

 inevitable that the glacier moved up the valley, not down. The 

 broad U -shape of the valley above the moraine may be due in part 

 to glacial scour, the glacier at one time having occupied a more 

 advanced position than it did when the moraine in question was 

 being built. It is more than probable, however, that the U-profile 

 is largely the result of the glacial fill resulting from deposition in the 

 valley when occupied by the ice-dammed lake. Much of the old 

 lake bed is still very fiat and swampy. 



Along Elk (Elkhorn) Creek, on the line between sections L3 and 

 24, T. 55 N., R. 105 W., is another well-marked moraine, in the 

 bowlder-clay of which were noted striated bowlders of limestone, 

 granite, and Deadwood flat-pebble conglomerate. Very little 

 andesite occurs in the moraine, though the andesite walls close in 

 completely, only about three miles above. A careful search up 

 creek from the moraine to where the andesite covers all the older 

 rocks shows no exposures older than the Madison limestone (Mis- 

 sissippian), although both granite and Deadwood (Cambrian) 

 conglomerate bowlders were found occurring abundantly in the 

 moraine. Again the conclusion is inevitable that the ice moved 

 up the valley. 



Similar conditions were noted well toward the head of Russell 

 Creek, where moraines with very little andesite and much granite 

 were found resting directly on andesite outcrops. Along Lodge 



I Arnold Hague, Absaroka Folio, No. 52. 



