Tuff breccia schist and minor iron-formation (WIWt;0)

Tuff breccia schist and minor iron-formation - Pink and gray, layered quartzofeldspathic schist of intermediate volcanic composition and associated thin iron-formation. Felsic gneiss at Arbutus Dam on Black River at Hatfield has U-Pb zircon age of about 2800 Ma (Sims and others, 1989)

State	Wisconsin
Name	Tuff breccia schist and minor iron-formation
Geologic age	Late Archean
Original map label	Wt
Comments	Marshfield terrane
Primary rock type	schist
Secondary rock type	gneiss
Other rock types	iron formation
Lithologic constituents	Major Metamorphic > Schisttuff breccia schist Minor Metamorphic > Gneiss Incidental Sedimentary > Chemical > Banded-iron-formationthin iron-formation
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, 1989, Tectonostratigraphic evolution of the Early Proterozoic Wisconsin magmatic terranes of the Penokean orogen: Canadian Journal of Earth Sciences, v. 26, p. 2145-2158
Geographic coverage	Clark - Jackson