- Usage in publication:
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- Bayfield gravel*
- Modifications:
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- Original reference
- Dominant lithology:
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- Gravel
- AAPG geologic province:
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- San Juan basin
Summary:
Bayfield gravel. Pebbles and boulders scattered over the surface at high levels within San Juan Mountain range or on crests of foothills. Lie at altitude of 8,000 to 13,000+ feet, but always near the summit levels. Composed chiefly of pebbles less than 5 inches diameter. Thickness 0 to 200+ feet. Contemporaneous with Los Pinos and Bridgetimber gravels. Age is Tertiary(?) (Pliocene?).
Named from occurrence on several hills a few mi north of Bayfield, La Plata Co., southwestern CO.
Source: US geologic names lexicon (USGS Bull. 896, p. 128); supplemental information from 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 ([ ]).