- Usage in publication:
-
- Wassum formation
- Modifications:
-
- Named
- Dominant lithology:
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- Limestone
- Shale
- AAPG geologic province:
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- Appalachian basin
Summary:
Named the Wassum formation for Wassum, Smyth Co., VA. Consists of calcarenites and buff crumbly shales. Total thickness is 150 feet. Unit overlies the Chatham Hill formation and underlies the Bays Formation. The Wassum is of Middle Ordovician (Mohawkian) age.
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 ([ ]).