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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.
State Maryland
Name Quartz Gabbro and Quartz Diorite Gneiss
Geologic age Paleozoic
Primary rock type gabbro
Secondary rock type quartz 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Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD
Counties Harford