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Baraga Group; Copps Formation

Baraga Group; Copps Formation - Fine- to medium-grained graywacke and less abundant gray to black slate. Thin basal conglomerate west of Lake Gogebic contains clasts of underlying Archean rocks in a quartzitic and argillaceous matrix.
StateMichigan
NameBaraga Group; Copps Formation
Geologic ageEarly Proterozoic
Original map labelXc
Commentscontinental margin assemblage (north of Niagara Fault)
Primary rock typegraywacke
Secondary rock typeslate
Other rock typesmeta-conglomerate
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Minor
Sedimentary > Clastic > Conglomerate (Bed)
Metamorphic > Metasedimentary > Metaclastic > Slate (Bed)
Map references
Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Map I-2185, scale= 1:500,000
Unit references
Sims, P.K., 1992, Geologic map of Precambrian rocks, southern Lake Superior region, Wisconsin and northern Michigan: U.S. Geological Survey Miscellaneous Investigations Map I-2185, scale= 1:500,000
Geographic coverageGogebic

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