| State | Pennsylvania |
|---|---|
| Name | Banded mafic gneiss |
| Geologic age | Precambrian |
| Lithologic constituents |
Major
Metamorphic > Gneissbanded mafic gneiss - dark, fine to medium grained; includes rocks of probable sedimentary origin; may be equivalent to "pCAmgh."
Minor
Metamorphic > Metasedimentary > Paragneissincludes rocks of probable sedimentary origin; may be equivalent to ""pCAmgh.""
|
| Comments | Digital map differences from 1980 printed map: name changed from (Gabbroic gneiss and gabbro). |
| 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 - Lancaster |