- Usage in publication:
-
- Old Breastworks Formation*
- Modifications:
-
- Named
- Dominant lithology:
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- Silt
- AAPG geologic province:
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- Upper Mississippi embayment
Summary:
Old Breastworks Formation at base of Wilcox Group named in Lauderdale Co., TN. Consists of gray, lignitic, clayey micaceous silt. Thickness 85 m. Overlies Porters Creek Clay of Midway Group and underlies Fort Pillow Sand of Wilcox Group. Age is early Eocene.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Old Breastworks Formation*
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Upper Mississippi embayment
Summary:
Shown in Table 1 as Paleocene age in the Mississippi embayment part of western TN at Memphis. Reasons for this age assignment not provided. Old Breastworks considered early Eocene by Moore (1969).
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Old Breastworks Formation*
- Modifications:
-
- Areal extent
- AAPG geologic province:
-
- Upper Mississippi embayment
Summary:
Old Breastworks Formation, Fort Pillow Sand, and Flour Island Formation, all of Wilcox Group, are geographically extended into northeastern AR and southeastern MO. Wilcox Group overlies Porters Creek Clay of Midway Group; underlies Memphis Sand of Claiborne Group.
Source: GNU records (USGS DDS-6; Reston 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 ([ ]).