Ultramafic rocks

Includes serpentine, steatite, and other products of alteration of peridotites and pyroxenites.
State Pennsylvania
Name Ultramafic rocks
Geologic age Probably lower Paleozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Serpentinite
Minor
Metamorphic > Metaigneous > Metaintrusive > Metaultramafic > Metaperidotiteultramafic rocks - includes serpentine, steatite, and other products of alteration of peridotites and pyroxenites
Metamorphic > Metaigneous > Metaintrusive > Metaultramafic > Metapyroxeniteultramafic rocks - includes serpentine, steatite, and other products of alteration of peridotites and pyroxenites
Comments Digital map differences from 1980 printed map: name and map symbol changed from Xs (Serpentinite).
References

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 Bucks - Chester - Delaware - Lancaster - Montgomery - Philadelphia - York