Sams Creek Metabasalt

Altered basaltic flows, some amygdaloidal; green, schistose, containing hornblende, epidote, chlorite, and quartz.
State Pennsylvania
Name Sams Creek Metabasalt
Geologic age Probably lower Paleozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > Metabasaltmetabasalt - altered basaltic flows, some amygdaloidal; green, schistose, containing hornblende, epidote, chlorite, and quartz
Comments Digital map differences from 1980 printed map: name and map symbol changed from (Wissahickon Formation, metavolcanics) (Xwv).
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 Lancaster - York