- Usage in publication:
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- Sander Basalt*
- Modifications:
-
- Named
- Dominant lithology:
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- Basalt
- AAPG geologic province:
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- Piedmont-Blue Ridge province
- Culpeper basin
Summary:
Following the informal usage of Lee (1979, 1980), the uppermost basalt in the Culpeper basin is here named the Sander Basalt of the Culpeper Group for exposures at the Sander quarry, Fauquier Co., VA. It consists of four or more flow units of black, mostly holocrystalline and equigranular tholeiitic basalt. Three or more lenticular units of sandstone and siltstone are sandwiched between the flow, which extend for more than 60 km (35 mi) in the western part of the basin. It disconformably or paraconformably overlies the Turkey Run Formation and paraconformably or conformably underlies the Waterfall Formation. Thickness ranges from 140 to 600 m (460 to 2,000 ft). Age is Early Jurassic, based on palynoflora in shales of the underlying and overlying formations.
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 ([ ]).