- Usage in publication:
-
- Happy Valley Branch Member*
- Modifications:
-
- Named
- Dominant lithology:
-
- Volcaniclastics
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Happy Valley Branch named as one of eight members of James Run Formation of Glenarm Group in northeastern MD. Unit is composed of light-gray to white, fine-grained, medium- to thin-bedded metamorphosed felsic volcaniclastic rocks with relict phenocrysts of sodic plagioclase and quartz. Overlies Gilpins Falls Member. Probably partly equivalent to Big Elk Creek and Principio Creek Members (both new) of James Run Formation. Age is early Paleozoic.
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 ([ ]).