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Libertytown Metarhyolite

Libertytown Metarhyolite - 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 (?)
Primary rock type rhyolite
Secondary rock type phyllite
Other rock types andesite; slate
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
Map references
Cleaves, E.T., Edwards, J., Jr., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.
Unit references
Cleaves, E.T., Edwards, J., Jr., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.
Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD
Counties Carroll - Frederick