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Ultramafic Rocks

Ultramafic Rocks - Chiefly serpentinite with partly to completely altered dunite, peridotite, pyroxenite, and massive to schistose soapstone; talc-carbonate rock and altered gabbro are common in some bodies.
StateMaryland
NameUltramafic Rocks
Geologic ageEarly Paleozoic - Late Precambrian (?)
Original map labelum
Primary rock typeserpentinite
Secondary rock typedunite
Other rock typesperidotite; pyroxenite; gabbro
Lithologic constituents
Major
Metamorphic > Metaigneous > Serpentinite
Incidental
Igneous > Plutonic > Ultramafic > Peridotite
Igneous > Plutonic > Ultramafic > Peridotite > Dunite
Igneous > Plutonic > Gabbroic > Gabbro
Igneous > Plutonic > Ultramafic > Pyroxenite
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Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD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 coverageBaltimore - Carroll - Cecil - Harford - Howard - Montgomery - Baltimore

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