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

Geologic units in Menominee county, Michigan

[Additional scientific data in this geographic area]

Sinnipee Group (Ordovician) at surface, covers 0.1 % of this area

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

Lithology: dolostone (dolomite); limestone; shale

Mafic metavolcanic rocks (Early Proterozoic) at surface, covers 0.6 % 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

Prairie du Chien Group (Ordovician) at surface, covers 0.2 % of this area

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

Lithology: dolostone (dolomite); sandstone; shale

Munising Formation (Late Cambrian) at surface, covers 8 % of this area

Munising Formation

Lithology: sandstone; shale; conglomerate

Black River Limestone (Late Ordovician) at surface, covers 16 % of this area

Black River Limestone

Lithology: limestone

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

Trempealeau Formation (Late Cambrian) at surface, covers 21 % of this area

Trempealeau Formation

Lithology: sandstone; shale; dolostone (dolomite)

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

Rhyolite to dacite (Early Proterozoic) at surface, covers < 0.1 % 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 < 0.1 % of this area

Basaltic and andesitic breccia - Exposed in northeastern Wisconsin

Lithology: volcanic breccia (agglomerate)

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

Prairie du Chien Group (Early Ordovician) at surface, covers 26 % of this area

Prairie du Chien Group

Lithology: dolostone (dolomite); sandstone; shale

Athelstane Quartz Monzonite (Early Proterozoic) at surface, covers < 0.1 % 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

Metagabbro (Early Proterozoic) at surface, covers 0.6 % 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

Rhyolite to dacite (Early Proterozoic) at surface, covers 0.4 % of this area

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

Lithology: felsic metavolcanic rock

Granitic rocks of 1760-Ma age group (Early Proterozoic) at surface, covers < 0.1 % 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 0.3 % 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

Basaltic and andesitic breccia (Early Proterozoic) at surface, covers 0.3 % of this area

Basaltic and andesitic breccia - Exposed in northeastern Wisconsin

Lithology: volcanic breccia (agglomerate)

Trenton Limestone (Late Ordovician) at surface, covers 25 % of this area

Trenton Limestone

Lithology: limestone; dolostone (dolomite); shale

Dacite and volcanogenic graywacke (Early Proterozoic) at surface, covers 0.8 % 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

Athelstane Quartz Monzonite (1836 +/- 15 Ma) (Early Proterozoic) at surface, covers 0.2 % of this area

Athelstane Quartz Monzonite (1836 +/- 15 Ma) - 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.

Lithology: granite; granodiorite

Cambrian, undivided (Cambrian) at surface, covers 0.2 % 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