Menominee Group; Negaunee Iron-formation

Highly metamorphosed banded iron-formation. Principal iron-formation in Marquette trough and nearby areas. Includes abundant metadiabase sills.
State Michigan
Name Menominee Group; Negaunee Iron-formation
Geologic age Early Proterozoic
Lithologic constituents
Major
Sedimentary > Chemical > Banded-iron-formation (Bed)highly metamorphosed banded iron-formation with abundant metadiabase sills
Minor
Metamorphic > Metaigneous > Metaintrusive > Metadiabasehighly metamorphosed banded iron-formation with abundant metadiabase sills
Comments Continental margin assemblage (north of Niagara Fault)
References
NGMDB product
Counties Marquette