| State | Maryland |
|---|---|
| Name | Wissahickon Formation (Undivided) |
| Geologic age | Late Precambrian (?) |
| Lithologic constituents |
Major
Metamorphic > Schist > Mica-schist > Muscovite-schist
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Incidental
Metamorphic > Schistchloritoid schist
|
| References | Cleaves, E.T., Edwards, J., Jr., and Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.In 1995 the Water Resources Division of the U.S. Geological Survey digitized the geologic map of Maryland from the 1968 paper map (Reference MD001). Information about products from the Maryland Geological Survey can be found at http://www.mgs.md.gov/. |
| NGMDB product | |
| Counties | Baltimore - Carroll - Cecil - Harford - Howard - Montgomery |