- Usage in publication:
-
- Landrum shale member
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Shale
- Marl
- AAPG geologic province:
-
- East Texas basin
Summary:
Pg. 20 (table), 125, 134-148. Landrum shale member of Crockett formation. Series of brown lignitic shales and marls about 100 feet thick, overlying Wheelock marl member (new) and underlying Spiller sand member (new) of Crockett formation. Lower and upper boundaries transitional and interfingering. [Age is middle Eocene (Claiborne).]
Type locality: on north-flowing tributary of Two-Mile Creek which enters Two-Mile Creek on William Johnson Survey; Two-Mile Creek flows through the J.L. Landrum Survey near Two-Mile Church, Leon Co., eastern TX.
Source: US geologic names lexicon (USGS Bull. 1200, p. 2099).
- Usage in publication:
-
- Landrum member
- Modifications:
-
- Revised
- AAPG geologic province:
-
- East Texas basin
Summary:
Pg. 1665-1671. Landrum member of Cook Mountain formation. Reallocated to member status in Cook Mountain formation. Includes bentonite-bearing Hurricane marine lentil (new). [Age is middle Eocene (Claiborne).]
Source: US geologic names lexicon (USGS Bull. 1200, p. 2099).
- Usage in publication:
-
- Landrum Member
- Modifications:
-
- Areal extent
- Dominant lithology:
-
- Marl
- Clay
- Limestone
- AAPG geologic province:
-
- Gulf Coast basin
- East Texas basin
Summary:
Landrum Member of Cook Mountain Formation. Marl and clay, glauconite, limestone lentils, lower part bentonitic, marine megafossils. Thickness about 100 feet. Lies above Wheelock Member and below Spiller Member (both of Cook Mountain). Age is Eocene.
Not separately mapped. (Cook Mountain [undivided] mapped in southeastern corner of map sheet in Madison and Leon Cos., eastern TX.)
Source: Publication.
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 ([ ]).