USGS Home
Contact USGS
Search USGS

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

Geologic units in Marinette county, Wisconsin

[Additional scientific data in this geographic area]

Peshtigo Mangerite in the Wolf River batholith (1470 Ma); Peshtigo Mangerite (Middle Proterozoic) at surface, covers 0.7 % of this area

Peshtigo Mangerite in the Wolf River batholith (1470 Ma); Peshtigo Mangerite - Brown to dark-gray, coarse-grained (0.3-1.5 cm) inequigranular monzonite containing subhedral, zoned plagioclase, alkali feldspar, mafic silicates (fayalite, hypersthene, ferroaugite-hedenbergite, hornblende, and biotite), and interstitial quartz

Lithology: monzonite

Mafic metavolcanic rocks (Early Proterozoic) at surface, covers < 0.1 % 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

Sinnipee Group (Ordovician) at surface, covers 11 % of this area

Sinnipee Group - Dolomite with some limestone and shale; includes Galena, Decorah, and Platteville Formations

Lithology: dolostone (dolomite); limestone; shale

Rhyolite to dacite (Early Proterozoic) at surface, covers 0.9 % of this area

Rhyolite to dacite - Massive to flow-banded rocks of greenschist metamorphic grade in northeastern Wisconsin; virtually undeformed.

Lithology: felsic metavolcanic rock

Basaltic and andesitic breccia (Early Proterozoic) at surface, covers 0.4 % of this area

Basaltic and andesitic breccia - Exposed in northeastern Wisconsin

Lithology: volcanic breccia (agglomerate)

Mafic metavolcanic rocks (Early Proterozoic) at surface, covers 10 % 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

Baraga Group; Michigamme Formation, undivided (Early Proterozoic) at surface, covers < 0.1 % of this area

Baraga Group; Michigamme Formation, undivided - Thick and stratigraphically varied formation of sedimentary and less abundant volcanic rocks. Metamorphosed graywacke is predominant rock of Michigamme Formation. Calcareous concretions common. Metamorphosed from cholorite to sillimanite grade (Cannon, 1986). Mapped undivided in poorly exposed areas

Lithology: graywacke

Quartzite (Early Proterozoic) at surface, covers 0.3 % of this area

Quartzite - Maroon but locally white, gray, and red quartzite (quartz arenite) with a basal quartzose conglomerate. At Flambeau Ridge (Chippewa County) consists of conglomerate. Distinguished from other quartzite units in being strongly deformed and metamorphosed. Includes Flambeau, Rib Mountain, McCaslin, and Thunder Mountain Quartzites of local usage

Lithology: quartzite; conglomerate

Trempealeau Formation (Late Cambrian) at surface, covers < 0.1 % of this area

Trempealeau Formation

Lithology: sandstone; shale; dolostone (dolomite)

Dacite and volcanogenic graywacke (Early Proterozoic) at surface, covers 2 % of this area

Dacite and volcanogenic graywacke - Includes andesite tuff. Occurs in northeastern Wisconsin. Dacite has age of 1866 +/- 39 Ma.

Lithology: dacite; graywacke; andesite

Ancell Group (Ordovician) at surface, covers 0.8 % of this area

Ancell Group - Orthoquartzitic sandstone with minor limestone, shale and conglomerate; includes Glenwood and St. Peter Formations

Lithology: sandstone; limestone; shale; conglomerate

Bimodal mafic and felsic metavolcanic rocks (Early Proterozoic) at surface, covers 2 % of this area

Bimodal mafic and felsic metavolcanic rocks - High-aluminum basalt to low-silica andesite pillowed flows and interlayered dacite to rhyolite tuffs and porphyries in Monico and Mountain areas, northeastern Wisconsin. A rhyolite porphyry at Jennings (Oneida County) has an age of 1869 +/- 6 Ma. Rocks are host to massive sulfide deposits (Crandon and Pelican River)

Lithology: basalt; andesite; dacite; rhyolite

Munising Formation (Late Cambrian) at surface, covers < 0.1 % of this area

Munising Formation

Lithology: sandstone; shale; conglomerate

Prairie du Chien Group (Ordovician) at surface, covers 9 % of this area

Prairie du Chien Group - Dolomite with some sandstone and shale; includes Shakopee and Oneota Formations

Lithology: dolostone (dolomite); sandstone; shale

Wolf River batholith (1470 Ma); Hager Formation; Rhyolite member (Middle Proterozoic) at surface, covers 0.4 % of this area

Wolf River batholith (1470 Ma); Hager Formation; Rhyolite member- Gray to reddish-gray, slightly foliated, porphyritic rhyolite containing aligned phenocrysts of alkali feldspar and lesser amounts of plagioclase in a fine-grained matrix of feldspar, biotite, amphibole, and sparse quartz

Lithology: rhyolite

Granitic rocks of 1760-Ma age group (Early Proterozoic) at surface, covers 4 % 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

Baraga Group; Michigamme Formation, undivided (Early Proterozoic) at surface, covers < 0.1 % of this area

Baraga Group; Michigamme Formation, undivided - Thick and stratigraphically varied formation of sedimentary and less abundant volcanic rocks. Metamorphosed graywacke is predominant rock of Michigamme Formation. Calcareous concretions common. Metamorphosed from cholorite to sillimanite grade (Cannon, 1986). Mapped undivided in poorly exposed areas

Lithology: graywacke; metasedimentary rock

Metagabbro (Early Proterozoic) at surface, covers < 0.1 % 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: gabbroid; ultramafic intrusive rock; diorite

Athelstane Quartz Monzonite (Early Proterozoic) at surface, covers 17 % of this area

Athelstane Quartz Monzonite - Pink, coarse-grained granite to granodiorite containing nearly equal amounts of microcline microperthite, plagioclase, and quartz and 5-10 percent biotite and (or) hornblende. Mafic minerals are interstitial and give a clotty appearance. (1836 +/- 15 Ma)

Lithology: granite; granodiorite

Wolf River Batholith; Belongia Granite (Middle Proterozoic) at surface, covers 1 % of this area

Wolf River Batholith; Belongia Granite- Red to pink granite consisting of both a coarse-grained and a fine-grained facies. Probably an epizonal intrusion

Lithology: granite

Mafic to felsic metavolcanic rocks (Early Proterozoic) at surface, covers 11 % 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

Granite-tonalite (Early Proterozoic) at surface, covers 6 % 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

Metagabbro (Early Proterozoic) at surface, covers < 0.1 % 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

Cambrian, undivided (Cambrian) at surface, covers 14 % of this area

Cambrian, undivided - Sandstone with some dolomite and shale, undivided; includes Trempealeau, Tunnel City, and Elk Mound Formations

Lithology: sandstone; dolostone (dolomite); shale

Dacite and volcanogenic graywacke (Early Proterozoic) at surface, covers < 0.1 % of this area

Dacite and volcanogenic graywacke - Includes andesite tuff. Occurs in northeastern Wisconsin. Dacite has age of 1866 +/- 39 Ma.

Lithology: dacite; graywacke; andesite

Quartz diorite (Early Proterozoic) at surface, covers 4 % 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

Trenton Limestone (Late Ordovician) at surface, covers < 0.1 % of this area

Trenton Limestone

Lithology: limestone; dolostone (dolomite); shale

Wolf River batholith (1470 Ma); High Falls Granite (Middle Proterozoic) at surface, covers 3 % of this area

Wolf River batholith (1470 Ma); High Falls Granite - Gray to pink, equigranular to porphyritic granite to granodiorite containing microcline microperthite, concentrically zoned plagioclase, quartz, biotite, and hornblende

Lithology: granite; granodiorite

Basaltic and andesitic breccia (Early Proterozoic) at surface, covers < 0.1 % of this area

Basaltic and andesitic breccia - Exposed in northeastern Wisconsin

Lithology: volcanic breccia (agglomerate)