GLACIATION IN THE TELLURIDE QUADRANGLE 529 
branches of the basin. In the southeast part of the south branch 
the roches moutonnées forming the bottom of the basin are not more 
than 300 feet lower than the steep-sided ridge which forms the 
divide between Ingram basin and Mineral basin; it is therefore 
believed that the upper surface of the glaciers occupying these two 
basins was continuous at the time of the maximum extent of ice in 
the more recent epoch of glaciation. 
The lower part of the course of Ingram Creek as named on the 
Telluride topographic sheet is an extension of the upper part of the 
valley of the San Miguel River. From about 11,000 feet in eleva- 
tion, the stream descends in a series of falls and cataracts to its 
junction with Bridal Veil Creek, a total fall of over 1,500 feet in 
about seven-tenths of a mile. Immediately above elevation 
11,000 feet, the valley has the U-shaped cross-section. At a higher 
elevation it assumes the form common to the high glaciated valleys 
in this region. The maximum thickness of ice in this valley was 
probably about 500 feet. 
