Octoraro Formation

Includes albite-chlorite schist, phyllite, some hornblende gneiss, and granitized members.
State Pennsylvania
Name Octoraro Formation
Geologic age Probably lower Paleozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Metamorphic > Schistalbite-chlorite schist
Minor
Metamorphic > Gneiss > Hornblende-gneiss
Igneous > Plutonic > Graniticgranitized members
Comments Digital map differences from 1980 printed map: name and map symbol changed from (Wissahickon Formation, albite-chlorite schist) (Xwc).
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 Chester - Delaware - Lancaster - Montgomery - York