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Menominee Group, undivided

Menominee Group, undivided - Includes Negaunee Iron-formation, Siamo Slate, and Ajibik Quartzite in areas where units are too thin to map individually.
StateMichigan
NameMenominee Group, undivided
Geologic ageEarly Proterozoic
Original map labelXmu
CommentsContinental margin assemblage (north of Niagara Fault)
Primary rock typeslate
Secondary rock typequartzite
Other rock typesiron formation
Lithologic constituents
Major
Sedimentary > Chemical > Banded-iron-formationIncludes Negaunee Iron-formation, Siamo Slate, and Ajibik Quartzite in areas where units are too thin to map individually..
Metamorphic > Metasedimentary > Metaclastic > SlateIncludes Negaunee Iron-formation, Siamo Slate, and Ajibik Quartzite in areas where units are too thin to map individually..
Metamorphic > Metasedimentary > Metaclastic > QuartziteIncludes Negaunee Iron-formation, Siamo Slate, and Ajibik Quartzite in areas where units are too thin to map individually..
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 coverageBaraga - Dickinson - Iron - Marquette

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