612 ALLEN DAVID HOLE 
CIRQUE NORTHEAST OF SUNSHINE MOUNTAIN 
The only:valley on the west side of the lower valley of Lake 
Fork which was occupied by a tributary glacier was that one 
heading in the cirque northeast of Sunshine Mountain. This 
cirque has practically no exposures of bed rock in its bottom, since 
the shale which constitutes the underlying formation here weathers 
readily. In the lower part of the cirque, at an elevation of about 
11,000 feet, the slope of the bottom averages about 12°; at 11,300 
feet, 20° to 25°; back of this are steep slopes of talus, and above the . 
talus the nearly perpendicular walls of the Telluride formation and 
igneous rock. 
VALLEY OF HOWARD FORK 
Howard Fork has but two tributaries that were occupied by 
glaciers in the more recent epoch, viz., Swamp Canyon and 
Waterfall Creek. On all sides of Swamp Canyon and its tributaries 
are found the usual abundant talus accumulations and nearly per- 
pendicular bounding walls. At an elevation of about 11,500 feet, 
both in the main valley and in the tributary valley on the west, the 
rounded, smoothed outlines of roches moutonnées appear. Striated 
bowlders were found near the western tributary at an elevation of 
11,200 feet. In the lower part of its course the valley shows but 
little outcrop of rock in place. The maximum thickness of ice in 
Swamp Canyon was probably from 500 to 800 feet. 
The valley of Waterfall Creek has numerous roches moutonnées 
above 11,000 feet in elevation, with striae in some places approxi- 
mately parallel to the direction of the stream. On the west side of 
the stream just below the last tributary valley, drift with striated 
bowlders occurs at 10,750 and at 10,900 feet in elevation. Long 
talus slopes and cliffs with nearly perpendicular faces form the 
boundary of the well-cleaned-out valley. 
The eastern end of the valley of Howard Fork toward Ophir 
~ Pass closely resembles Swamp Canyon in its main features. In the 
bottom near the stream is a narrow, flattened area, containing a few 
small ponds; higher up, talus is abundant. ‘The rounded points of 
exposed rock in place in Ophir Pass indicate that glacial ice was 
continuous from the valley of Howard Fork over the divide to 
the east. 
