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Menominee Group; Blair Creek Formation

Menominee Group; Blair Creek Formation - Dominantly dark-gray, massive, porphyritic tholeiitic basalt. Includes a basal conglomerate and a lean iron-formation in middle of formation
StateWisconsin
NameMenominee Group; Blair Creek Formation
Geologic ageEarly Proterozoic
Original map labelXbc
Commentscontinental margin assemblage (north of Niagara Fault)
Primary rock typebasalt
Secondary rock typeiron formation
Other rock typesconglomerate
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)Dominantly dark-gray, massive, porphyritic tholeiitic basalt
Minor
Sedimentary > Chemical > Banded-iron-formation (Bed)
Metamorphic > Metasedimentary > Metaclastic > Metaconglomerate (Bed)basal metacomglomerate
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 coverageAshland - Iron - Vilas

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