Baltimore Gabbro Complex (MDbgb;7)

Baltimore Gabbro Complex

Hypersthene gabbro with subordinate amounts of olivine gabbro, norite, anorthositic gabbro, and pyroxenite; igneous minerals and textures well preserved in some rocks, other rocks exhibit varying degrees of alteration and recrystallization with a new metamorphic mineral assemblage.

State	Maryland
Name	Baltimore Gabbro Complex
Geologic age	Late Precambrian (?) - Early Paleozoic
Lithologic constituents	Major Igneous > Plutonic > Gabbroic > Gabbro Minor Igneous > Plutonic > Ultramafic > Pyroxenite Igneous > Plutonic > Gabbroic > Gabbro > Norite
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	Anne Arundel - Baltimore - Cecil - Harford - Howard - Prince George's - Baltimore

Baltimore Gabbro Complex

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/.