- Usage in publication:
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- Pine Valley Gravel*
- Modifications:
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- Named
- Dominant lithology:
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- Gravel
- AAPG geologic province:
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- Denver basin
Summary:
Named for Pine Valley, U.S. Air Force Academy site, El Paso Co, CO in the Denver basin. Type locality is in a roadcut in SW1/4 NE1/4 sec 36, T12S, R67W. Occurs in eastern part of Lehman Valley, eastern part of South Lehman Valley, east part of Douglass Valley, and almost the entire area east of Monument Creek on the Air Force Academy site and east. Consists primarily of reddish-brown fragments of Pikes Peak Granite, some of which have been reworked from the older Lehman Ridge and Douglass Mesa Gravels. Contains a greater admixture of sand, silt, and clay than do the older gravels. Some of the boulders in the "boulder trains" are as much as 18 inches in diameter. The "trains" follow old stream channels. Was derived from Dawson Arkose east of Academy site. Ranges from 5 to 30 ft. Measured section. Is younger than Douglass Mesa Gravel (new) and older than Kettle Creek Alluvium (new). Correlated with Slocum Alluvium of Denver area. Of Pleistocene age, of Illinoian or Sangamon. Geologic map.
Source: GNU records (USGS DDS-6; Denver GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).