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- Usage in publication:
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- Williamson Creek member
- Modifications:
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- Original reference
- Dominant lithology:
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- Clay
- Sand
- AAPG geologic province:
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- Gulf Coast basin
Summary:
Pg. 118 (fig. 26), 161-164, geol. map. Williamson Creek member of Fleming formation. Consists of thick group of nonmarine silts and silty clays, with incorporated sand lentils and local brackish-water clay tongues. Total thickness approximately 500 feet. Overlies Dough Hills member (new), and contact arbitrarily is placed in clayey-silt sequence where sand lentils begin to appear in abundance; underlies Castor Creek member (new), and contact is placed where sand lentils are replaced by silty clay sequence grading upward into calcareous clays. [Age is Miocene.]
Typically exposed in uplands within drainage area of Williamson Creek headwaters south of Dough Hills, Rapides Parish, central LA.
Source: US geologic names lexicon (USGS Bull. 1200, p. 4245).
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 ([ ]).