Muscovite Quartz Monzonite Gneiss

Well foliated to nearly massive quartz monzonite gneiss, generally medium-grained and even textured but locally porphyritic and pegmatitic.
State Maryland
Name Muscovite Quartz Monzonite Gneiss
Geologic age Paleozoic
Lithologic constituents
Metamorphic > Gneissgranitic gneiss

Cleaves, E.T., Edwards, J., Jr., and Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.

In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at

NGMDB product
Counties Baltimore - Harford