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Quartz Gabbro and Quartz Diorite Gneiss

Quartz Gabbro and Quartz Diorite Gneiss - Mixed rock zone of greenish-black, uralitized, quartz-bearing gabbro to dark gray, weakly gneissic, pyroxene-hornblende-biotite quartz diorite.
StateMaryland
NameQuartz Gabbro and Quartz Diorite Gneiss
Geologic agePaleozoic
Original map labelPzgd
Primary rock typegabbro
Secondary rock typequartz diorite
Other rock types
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Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD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 coverageHarford

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=MDPZgd;6
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