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Mineral Resources > Online Spatial Data > Geology > by state > Wisconsin Geology

Geologic units in Price county, Wisconsin

Biotite schist (Early Proterozoic) at surface, covers 14 % of this area

Biotite schist - Metamorphosed graywacke in poorly exposed areas in northwestern Wisconsin. Sample at one locality (near Blockhouse Lake, 10 km northeast of Park Falls, T. 40 N., R. 1 E.) has a U-Pb zircon age of 1852 +/- 6 Ma (Sims and others, 1985b)

Lithology: schist

Migmatitic gneiss and amphibolite (Late to Early Archean) (Archean) at surface, covers 2 % of this area

Migmatitic gneiss and amphibolite (Late to Early Archean) - Varied gneisses of mostly unknown age in cores of gneiss domes and fault-bounded uplifts (Archean gneiss terranes). Except for the Watersmeet dome (Late to Early Archean), all dated rocks are Late Archean. Includes granite of Late Archean age that transgresses gneisses and amphibolite.

Lithology: gneiss; amphibolite; granite

Mafic metavolcanic rocks (Early Proterozoic) at surface, covers 34 % of this area

Mafic metavolcanic rocks - Dominantly tholeiitic basalt and basaltic andesite flows and tuffs; associated with sheet dikes, massive and layered metagabbro, and ultramafic rocks. In northeastern Wisconsin, rocks have been named the Quinnesec Formation.

Lithology: basalt; andesite; gabbro; ultramafic intrusive rock

Mafic to felsic metavolcanic rocks (Early Proterozoic) at surface, covers 22 % of this area

Mafic to felsic metavolcanic rocks - Volcanic rocks in areas of sparse geologic data and nondefinitive magnetic and gravity data

Lithology: mafic metavolcanic rock; felsic metavolcanic rock

Granitic rocks of 1760-Ma age group (Early Proterozoic) at surface, covers 6 % of this area

Granitic rocks of 1760-Ma age group - In northern Wisconsin, granite to granodiorite of varied texture. In southern Wisconsin (not mapped separately), red to pink alkali-feldspar granophyric granite associated with rhyolites of both peraluminous and metaluminous affinities (unit Xr of Marshfield terrane).

Lithology: granite; granodiorite

Metagabbro (Early Proterozoic) at surface, covers 2 % of this area

Metagabbro - Mafic to ultramafic bodies defined and delineated principally by positive magnetic and gravity anomalies; includes diorite bodies. Comagmatic with unit Xmi

Lithology: gabbro; ultramafic intrusive rock; diorite

Granite-tonalite (Early Proterozoic) at surface, covers 20 % of this area

Granite-tonalite - Gray to pinkish-gray, medium-grained, generally equigranular granite to tonalite and granitoid gneiss; locally includes diorite. Intrudes older metavolcanic rocks. Zircon ages range from 1852 +/- 15 to 1862 +/- 5 Ma

Lithology: granite; tonalite; gneiss

Quartz diorite (Early Proterozoic) at surface, covers 0.7 % of this area

Quartz diorite - Includes Marinette Quartz Diorite of Dunbar Dome (Sims and others, 1985a) and nearby Twelve Foot Falls Quartz Diorite

Lithology: quartz diorite