Ranges from fine- to medium-grained, altered gabbro to hornblende gneiss.
State Pennsylvania
Name Metagabbro
Geologic age Probably lower Paleozoic
Lithologic constituents
Metamorphic > Gneiss > Hornblende-gneiss
Metamorphic > Metaigneous > Metaintrusive > Metagabbrometagabbro - ranges from fine- to medium-grained, altered gabbro

Berg, T.M., Edmunds, W.E., Geyer, A.R., and others, compilers, 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 1, 2nd ed., 3 sheets, scale 1:250,000.

Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000.

NGMDB product
Counties Chester - Lancaster