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- Usage in publication:
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- Union Church transition phase
- Modifications:
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- Original reference
- Dominant lithology:
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- Clay
- AAPG geologic province:
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- Arkla basin
Summary:
Pg. 78 (fig. 6), 99-100. [Union Church transition phase of Tullos member of Yazoo clay of Jackson group.] Alternating thin beds of sandy silts and clays which in upper 20 feet of section contain large light-brown concretions or slabs of fossils cemented by limonite. Occurs between Tullos member and overlying Verda member. [Age is late Eocene (Jackson).]
Well exposed at Union Church, in center of sec. 30, T. 10 N., R. 2 E., La Salle Parish, central LA.
Source: US geologic names lexicon (USGS Bull. 1200, p. 4018).
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 ([ ]).