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Metabasalt

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Derived from mafic to intermediate pyroclastic rocks and massive to pillowed lava flows. Unit mapped as Ramsey Formation by Prinz (1981) south of Gogebic Range; mapped as Mona Schist and Kitchi Schist in northern complex of Marquette District.
State Michigan
Name Metabasalt
Geologic age Late Archean
Lithologic constituents
Major
Metamorphic > Schistderived from mafic to intermediate pyroclastic rocks and massive to pillowed lava flows.
Metamorphic > Metaigneous > Metavolcanic > Metabasaltderived from mafic to intermediate pyroclastic rocks and massive to pillowed lava flows.
Comments Continental margin assemblage (north of Niagara Fault). Prinz, W. C., 1981, Geologic map of the Gogebic Range-Watersmeet area, Gogebic and Ontonagon Counties, Michigan: U.S. Geological Survey Miscellaneous Investigations Series Map I-1365, scale= 1:125,000
References

Prinz, W.C., 1981, Geologic map of the Gogebic Range-Watersmeet area, Gogebic and Ontonagon Counties, Michigan: U.S. Geological Survey Miscellaneous Investigations Series Map I-1365, scale 1:125,000.

https://pubs.er.usgs.gov/publication/i1365

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 Gogebic - Marquette