Menominee Group, undivided

Includes Negaunee Iron-formation, Siamo Slate, and Ajibik Quartzite in areas where units are too thin to map individually.
State Michigan
Name Menominee Group, undivided
Geologic age Early Proterozoic
Lithologic constituents
Major
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..
Sedimentary > Chemical > Banded-iron-formationIncludes Negaunee Iron-formation, Siamo Slate, and Ajibik Quartzite in areas where units are too thin to map individually..
Comments Continental margin assemblage (north of Niagara Fault)
References
NGMDB product
Counties Baraga - Dickinson - Iron - Marquette