Named for Douglass Mesa, its type locality, a prominent mesa between Douglass valley on the south and South Lehman valley on the north, U.S. Air Force Academy site, El Paso Co, CO in the Denver basin. Occurs also at east end of Jacks Valley, on Lehman Mesa, on Pine Mesa, on ridges west of mouth of Kettle Creek, and area east of Monument Creek. Composed of reddish-brown fragments of Pikes Peak Granite ranging in size from sand to boulders 6 ft in diameter, and of varying amounts of silt and clay. One-fourth inch pebbles of quartz and feldspar probably form the bulk of the gravel. Boulders are larger and more numerous near the mountains. Linear concentrations of boulders, or boulder trains, crop out on several mesas. Ranges from 5 to 50 ft thick. Three measured sections described. Is younger than Lehman Ridge Gravel (new) and older than Pine Valley Gravel (new). Correlated with Verdos Alluvium of Denver area. Of Pleistocene age, of Kansas or Yarmouth age. Geologic map.

Source: GNU records (USGS DDS-6; Denver GNULEX).