- Usage in publication:
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- Hidden Member
- Modifications:
-
- First used
- Dominant lithology:
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- Sandstone
- Siltstone
- Shale
- AAPG geologic province:
-
- Richmond basin
- Piedmont-Blue Ridge province
Summary:
Nomenclature in this report follows Ediger and others (in prep). Richmond basin sequence is divided into three formations (ascending): Tuckahoe, Turkey Branch, and Otterdale Formations of Newark Supergroup. Contacts are unconformable. Turkey Branch Formation (first used), a newly recognized sequence or rocks, is divided into the lower Hidden Member and the upper Tomahawk Creek Member (both first used in this report). Hidden Member is known only from well cuttings and seismic profiles. This unit is mainly restricted to areas of greater subsidence. Correlates with the upper Stagg Creek Member of the Doswell Formation in the Taylorsville basin. Age is middle Carnian.
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 ([ ]).