Menominee Group; unexposed magnetic unit (WIXam;0)

Menominee Group; unexposed magnetic unit - Surrounds gneiss domes in Gogebic County, Mich. and Vilas County, Wisc., and occurs in north-central Dickinson County. Probably correlative with part of Blair Creek Formation (unit Xbc). Previously correlated with uppermost unit of Blair Creek Formation (Sims and others, 1984).

State	Wisconsin
Name	Menominee Group; unexposed magnetic unit
Geologic age	Early Proterozoic
Original map label	Xam
Comments	Continental margin assemblage (north of Niagara Fault). Sims and others, 1984, Geology, geochemistry, and age of Archean and Early Proterozoic rocks in the Marenisco-Watersmeet area, northern Michigan: U.S. Geological Survey Professional Paper 1292-A, p. A1-A41
Primary rock type	iron formation
Secondary rock type	slate
Other rock types
Lithologic constituents	Major Sedimentary > Chemical > Banded-iron-formation (Bed) Minor Metamorphic > Metasedimentary > Metaclastic > Slate
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	Sims and others, 1984, Geology, geochemistry, and age of Archean and Early Proterozoic rocks in the Marenisco-Watersmeet area, northern Michigan: U.S. Geological Survey Professional Paper 1292-A,. p. A1-A41. [http://pubs.er.usgs.gov/publication/pp1292AB]
Geographic coverage	Iron - Vilas