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Libertytown Metarhyolite

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Purple, bluish-black, and red, dense, fine-grained metarhyolite with feldspar phenocrysts; interbedded with blue and purple amygdaloidal metaandesite; both rhyolite and andesite interbedded with blue, purple, and green phyllitic slates.
State Maryland
Name Libertytown Metarhyolite
Geologic age Late Precambrian (?)
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > MetarhyolitePurple, bluish-black, and red, dense, fine-grained metarhyolite with feldspar phenocrysts
Metamorphic > Metaigneous > Metavolcanic > Metaandesiteblue and purple amygdaloidal metaandesite
Minor
Metamorphic > Metasedimentary > Metaclastic > Slateblue, purple, and green phyllitic slates
References

Cleaves, E.T., Edwards, J., Jr., and Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.

In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at http://www.mgs.md.gov/.
NGMDB product
Counties Carroll - Frederick