State | Wisconsin |
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Name | Baraga Group; Tyler Formation |
Geologic age | Early Proterozoic |
Lithologic constituents |
Major
Sedimentary > Clastic > Siltstone (Bed)Light- to dark-gray, feldspathic, fine-grained sandstone, argillaceous siltstone, and argillite. Near base, ferruginous argillite contains beds of cherty sideritic and pyritic iron-formation
Sedimentary > Clastic > Sandstone (Bed)Light- to dark-gray, feldspathic, fine-grained sandstone, argillaceous siltstone, and argillite. Near base, ferruginous argillite contains beds of cherty sideritic and pyritic iron-formation
Minor
Sedimentary > Chemical > Banded-iron-formation (Bed)Light- to dark-gray, feldspathic, fine-grained sandstone, argillaceous siltstone, and argillite. Near base, ferruginous argillite contains beds of cherty sideritic and pyritic iron-formation
|
Comments | Continental margin assemblage (north of Niagara Fault) |
References | |
NGMDB product | |
Counties | Ashland - Bayfield - Iron |