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
Lithologic constituents
Metamorphic > Schisttuff breccia schist
Metamorphic > Gneiss
Sedimentary > Chemical > Banded-iron-formationthin iron-formation
Comments Marshfield terrane

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.

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.


NGMDB product
Counties Clark - Jackson