Granodiorite and Biotite Granite Gneiss (MDpCAg;2)

Granodiorite and Biotite Granite Gneiss

Light gray to pale green, fine-grained, granodiorite gneiss, and dark gray biotite granite gneiss with some augen gneiss; in places a sheared muscovite-biotite gneiss; local biotite schist bands; intruded by metadiabase feeder dikes of Catoctin Metabasalt.

State	Maryland
Name	Granodiorite and Biotite Granite Gneiss
Geologic age	Precambrian
Lithologic constituents	Major Metamorphic > Gneissgranitic gneiss Incidental Metamorphic > Metaigneous > Metaintrusive > Metadiabase
References	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 http://www.mgs.md.gov/.
NGMDB product	NGMDB product page for 16548
Counties	Frederick - Washington

Granodiorite and Biotite Granite 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 http://www.mgs.md.gov/.