Setters Formation

Upper member: Feldspathic mica schist and mica gneiss; total thickness 200 to 500 feet. Middle member: Impure quartzite interstratified with thin beds of mica schist; total thickness 200 to 500 feet. And Lower member: Medium-grained, feldspathic mica schist; locally granitized; total thickness 200 to 500 feet.
State Maryland
Name Setters Formation
Geologic age Late Precambrian (?)
Lithologic constituents
Metamorphic > Schist > Mica-schist
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Gneiss > Muscovite-gneiss
Stratigraphic units Glenarm Series

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

NGMDB product
Counties Baltimore - Carroll - Harford - Howard - Baltimore