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Setters Formation

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.
StateMaryland
NameSetters Formation
Geologic ageLate Precambrian (?)
Original map labelsf
Primary rock typemica schist
Secondary rock typegneiss
Other rock typesquartzite
Lithologic constituents
Major
Metamorphic > Schist > Mica-schist
Minor
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Metamorphic > Gneiss > Muscovite-gneiss
Map references
Cleaves, E.T., Edwards, J., Jr., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.
Unit references
Cleaves, E.T., Edwards, J., Jr., Glaser, J.D., 1968, Geologic Map of Maryland: Maryland Geological Survey, Baltimore, Maryland, scale 1:250,000.
Unpublished digital version of the Maryland state geologic map that was digitized by the USGS Water Resources Office in Towson, MD
Geographic coverageBaltimore - Carroll - Harford - Howard - Baltimore

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