- Usage in publication:
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- Mount Washington Amphibolite
- Modifications:
-
- Named
- Dominant lithology:
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- Amphibolite
- AAPG geologic province:
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- Piedmont-Blue Ridge province
Summary:
Named the Mount Washington Amphibolite of the Baltimore Mafic Complex for Mount Washington section of Baltimore City, northeastern MD. Consists of fine- to medium-grained, dark-green to black, plagioclase amphibolite. Unit is in thrust contact with Loch Raven Schist, Oella Formation, and Sykesville Formation. Overlies Hollofield Layered Ultramafite of the Baltimore Mafic Complex and is truncated by the James Run Formation to the southeast. The Mount Washington is of Cambrian(?) age.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Mount Washington Amphibolite*
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
The Mount Washington Amphibolite appears on the generalized geologic map of the MD Piedmont as part of the island arc rocks of the Bel Air-Rising Sun and Chopawamsic terrane.
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 ([ ]).