- Usage in publication:
-
- Tullos member
- Modifications:
-
- Original reference
- Dominant lithology:
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- Clay
- AAPG geologic province:
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- Arkla basin
Summary:
Pg. 78 (fig. 6), 98-99. Tullos clay member of Yazoo clay. Series of clays ranging in thickness from 75 to 175 feet; on fresh exposure clays are deep blue gray but weather to drab yellow, or light gray. Grades into overlying Verda member (new) through sandy concretionary transition phase herein named Union Church; overlies Moodys Branch marl. [Age is late Eocene (Jackson).]
Well exposed in grade cuts of Missouri Pacific RR, 0.5 mi southwest of Tullos Station, La Salle Parish, central LA.
Source: US geologic names lexicon (USGS Bull. 1200, p. 3974).
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 ([ ]).