State | Michigan |
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Name | Menominee Group; Ironwood Iron-formation |
Geologic age | Early Proterozoic |
Lithologic constituents | Major
Sedimentary > Chemical > Banded-iron-formation (Bed)Interbedded cherty and slaty iron-formation. Locally, secondary enrichment has formed "soft ore" bodies. In eastern part of Gogebic Range, Ironwood Iron-fomration is intercalated with pyroclastic rocks of Emperor Volcanic Complex, and in eastern half of T. 47 N., R. 43 W. (where mapped within unit Xip) consists entirely of black slate
Metamorphic > Metasedimentary > Metaclastic > SlateInterbedded cherty and slaty iron-formation. Locally, secondary enrichment has formed "soft ore" bodies. In eastern part of Gogebic Range, Ironwood Iron-fomration is intercalated with pyroclastic rocks of Emperor Volcanic Complex, and in eastern half of T. 47 N., R. 43 W. (where mapped within unit Xip) consists entirely of black slate
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Comments | Continental margin assemblage (north of Niagara Fault) |
References | |
NGMDB product | |
Counties | Gogebic |