Including a list of all known volcanoes and a summary of activity betwen 1760 and 1948.

From abstract: The origin of the gneissic rocks on the eastern border of the Idaho batholith in the Bitterroot Range, near Hamilton, Mont., has long been in dispute. Lindgren regarded these rocks as the product of stresses related to a normal fault along the front of the range with an eastward dip of about 150. He thought both the hanging wall and the footwall had moved, with a total displacement along the fault plane of at least 20,000 feet. The faulting was believed to have been so recent as to be a major factor in the present topography. Langton appears to accept the concept of faulting but to regard the gneissic rocks as formed much earlier from a granitic rock that was more silicic and older than the Idaho batholith.

This report describes the stratigraphy of Pleistocene and Recent deposits in the Denver area, Colorado that was conducted intermittently between 1948-52.

This report analyzes surficial deposits in the Louisville quadrangle, Colorado, that are divided into three main groups--pre-Wisconsin, Wisconsin, and Recent.