Generalized Surficial Geologic Map of the Denver 1°x2° Quadrangle, Colorado

Thirty-nine types of surficial geologic deposits and residual
materials of Quaternary age are described and mapped in the greater
Denver area, in part of the Front Range, and in the piedmont and
plains east of Denver, Boulder, and Castle Rock. Descriptions
appear in the pamphlet that accompanies the map. Landslide
deposits, colluvium, residuum, alluvium, and other deposits or
materials are described in terms of predominant grain size, mineral
or rock composition (e.g., gypsiferous, calcareous, granitic,
andesitic), thickness of deposits, and other physical
characteristics. Origins and ages of the deposits and geologic
hazards related to them are noted. Many lines between geologic
units on our map were placed by generalizing contacts on published
maps. However, in 1997-1999 we mapped new boundaries, as well. The
map was projected to the UTM projection. This large map area
extends from the Continental Divide near Winter Park and Fairplay (
on the west edge), eastward about 107 mi (172 km); and extends from
Boulder on the north edge to Woodland Park at the south edge (68
mi; 109 km).