This report is an account of research progress on rock glaciers of Afghanistan, Colorado, and Utah. Because of the preliminary nature of this work, some speculation is present; nevertheless, we think there is evidence for each major, new point expressed. The main thesis of our work is that rock glaciers are polygenetic and appear to be part of a continuum of similar landforms grading morphologically and, presumably, mechanically from one type to another type.
Shroder, John F. Jr. and Giardino, John R., "Progress on Rock Glacier Research" (1978). Geography and Geology Faculty Publications. 3.