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BASEMAPS
Default Weather
Temperature
Smoke
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WEATHER
Upper Pelitic Schist
Geologic Formation
near
Potomac
,
MD
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Lithology
Quartzite
Quartzite
Schist
Geologic Age
Precambrian Proterozoic (2500 Ma – 542 Ma ago)
Geologic Unit Label
Wups
(Formerly mapped as albite facies of Wissahickon Formation.) Albite-chlorite-muscovite-quartz schist with sporadic thin beds of laminated micaceous quartzite; coarsens from west to east; primary sedimentary structures include normal bedding, graded bedding, and soft-sediment deformational structures; apparent thickness 14,000 feet or more.
—
USGS
Taxonomy
Classified As
Geologic Formation
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