Metabasalt

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 Wisconsin
Name Metabasalt
Geologic age Late Archean
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanicderived from mafic to intermediate pyroclastic rocks and massive to pillowed lava flows.
Metamorphic > Schistderived 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
NGMDB product
Counties Ashland - Iron