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Mineral Resources On-Line Spatial Data

Urbana Formation

Urbana Formation - Dark gray to green sericite-chlorite phyllite, metasiltstone, and quartzite; thin lenses of impure marble and calcareous phyllite occur locally.
StateMaryland
NameUrbana Formation
Geologic ageLate Precambrian (?)
Original map labeluf
Primary rock typephyllite
Secondary rock typemeta-argillite
Other rock typesquartzite; marble
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Metasiltstonemeta-argillite
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Minor
Metamorphic > Metasedimentary > Metacarbonate > Marble
Metamorphic > Metasedimentary > Metaclastic > Quartzite
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Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD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 coverageFrederick

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