- Usage in publication:
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- Martinsville igneous complex
- Modifications:
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- Overview
- AAPG geologic province:
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- Piedmont-Blue Ridge province
Summary:
The informal Martinsville igneous complex of Ragland (1974) includes the Leatherwood Granite of Jonas (1928) along the VA-NC border and the Rich Acres Formation of Conley and Toewe (1968) in VA. The Rich Acres Formation consists of metadiorite and metagabbro that have relict igneous textures and occur as concordant to semiconcordant masses. The Leatherwood Granite is typically a porphyritic muscovite-biotite granite showing rapakivi texture. Leatherwood has been isotopically dated as Middle to Late Ordovician.
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 ([ ]).