Metabasalt (Late Archean) (WIWv;0)

Metabasalt (Late Archean) - 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 (Late Archean)
Geologic age	Late Archean
Original map label	Wv
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
Primary rock type	meta-basalt
Secondary rock type	tuff
Other rock types	schist
Lithologic constituents	Major Metamorphic > Schistderived from mafic to intermediate pyroclastic rocks and massive to pillowed lava flows. Metamorphic > Metaigneous > Metavolcanicderived from mafic to intermediate pyroclastic rocks and massive to pillowed lava flows.
Map 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 [http://pubs.er.usgs.gov/publication/i2185]
Unit 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 [http://pubs.er.usgs.gov/publication/i1365]
Geographic coverage	Ashland - Iron