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Badwater Greenstone

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Dark-greenish-gray, pillowed to massive tholeiitic basalt and pyroclastic rocks. Correlated with the Hemlock Formation on basis of geology and similarity in chemical composition.
State Michigan
Name Badwater Greenstone
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Greenstone
Igneous > Volcanic > Mafic-volcanic > Basalt (Volcaniclastic-volcanic breccia)
Comments Continental margin assemblage (north of Niagara Fault)
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.

https://pubs.er.usgs.gov/publication/i2185
NGMDB product
Counties Dickinson - Iron