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Mineral Resources On-Line Spatial Data

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.
StateMaryland
NameLibertytown Metarhyolite
Geologic ageLate Precambrian (?)
Original map labellmr
Primary rock typerhyolite
Secondary rock typephyllite
Other rock typesandesite; slate
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > Metaandesiteblue and purple amygdaloidal metaandesite
Metamorphic > Metaigneous > Metavolcanic > MetarhyolitePurple, bluish-black, and red, dense, fine-grained metarhyolite with feldspar phenocrysts
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Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD
Geographic coverageCarroll - Frederick

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