Posted by: magmatist | August 26, 2012
Boulder Glacier debris avalanches
The Boulder Glacier debris flows begin as debris avalanches near the summit of Sherman Peak. This aerial view by John Scurlock clearly shows that these events include a lot of rocky debris. The view looks south; debris is piled up in the East Breach of Sherman Crater.
An account of periodic muddy debris flows falling from Sherman Peak down the Boulder Glacier has been posted here https://mbvrc.wordpress.com/baker-facts/boulder-glacier-debris-flows/
Click this link to read the 1975 USGS study of these debris flows. It is a 2 MB pdf file: 1975 Frank,Post,Friedman- Boulder Glacier debris flows