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Geologic units in Marquette county, Michigan

Jacobsville Sandstone (Middle Proterozoic) at surface, covers 10 % of this area
Jacobsville Sandstone - Red, brown, and white quartzose sandstone, and minor siltstone, shale and conglomerate
Lithology: sandstone; siltstone; conglomerate; shale
Baraga Group; Volcanic-sedimentary unit (Early Proterozoic) at surface, covers < 0.1 % of this area
Baraga Group; Volcanic-sedimentary unit - Interlayered fine- to medium-grained metasedimentary rocks and metavolcanic rocks in poorly exposed areas in southern Baraga County, Mich.
Lithology: metasedimentary rock; metavolcanic rock
Baraga Group; Michigamme Formation; Mafic to intermediate flows and pyroclastic rocks, including Clarksburg Volcanics member (Early Proterozoic) at surface, covers 0.5 % of this area
Baraga Group; Michigamme Formation; Mafic to intermediate flows and pyroclastic rocks, including Clarksburg Volcanics member - Poorly exposed. Includes Clarksburg Volcanics member which is mostly mafic to intermediate pyroclastic rocks in Marquette trough, between Marquette Bay and Champion
Lithology: metavolcanic rock
Menominee Group, undivided (Early Proterozoic) at surface, covers 2 % of this area
Menominee Group, undivided - Includes Negaunee Iron-formation, Siamo Slate, and Ajibik Quartzite in areas where units are too thin to map individually.
Lithology: slate; quartzite; iron formation
Menominee Group; Composite unit of Siamo Slate and Ajibik Quartzite (Early Proterozoic) at surface, covers 1 % of this area
Menominee Group; Composite unit of Siamo Slate and Ajibik Quartzite - Siamo Slate is laminated green siltstone and argillite. Ajibik Quartzite is white, buff, and pink orthoquartzite and less abundant sericite quartzite.
Lithology: quartzite; argillite; siltstone; slate
Baraga Group; Michigamme Formation; Gray to black slate (Early Proterozoic) at surface, covers 2 % of this area
Baraga Group; Michigamme Formation; Gray to black slate - Strongly cleaved. Represents lower stratigraphic part of formation
Lithology: slate
Menominee Group; Negaunee Iron-formation (Early Proterozoic) at surface, covers 2 % of this area
Menominee Group; Negaunee Iron-formation - Highly metamorphosed banded iron-formation. Principal iron-formation in Marquette trough and nearby areas. Includes abundant metadiabase sills.
Lithology: iron formation; diabase
Baraga Group; Michigamme Formation, undivided (Early Proterozoic) at surface, covers 4 % 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
Menominee Group; Hemlock Formation (Early Proterozoic) at surface, covers 0.2 % of this area
Menominee Group; Hemlock Formation - Predominantly mafic to intermediate volcanic flows and pyroclastic rocks with interlayered slate and tuff beds
Lithology: basalt; andesite; pyroclastic; slate; tuff
Chocolay Group, undivided (Early Proterozoic) at surface, covers 1 % of this area
Chocolay Group, undivided - In Dickinson County, Mich., includes Randville Dolomite, Sturgeon Quartzite, and Fern Creek Formation. In Marquette range, between Marquette Bay and Champion, includes Wewe Slate, Kona Dolomite, Mesnard Quartzite, and Enchantment Lake Formation
Lithology: quartzite; dolostone (dolomite); slate
Metabasalt (Late Archean) (Late Archean) at surface, covers 5 % of this area
Metabasalt (Late Archean) - Derived from mafic to intermediate pyroclastic rocks and massive to pillowed lava flows. Unit mapped as Ramsey Formation by Prinz (1981) south of Gogebic Range; mapped as Mona Schist and Kitchi Schist in northern complex of Marquette District.
Lithology: meta-basalt; tuff; schist
Gneiss and amphibolite (Late Archean, 2.640-2.750 Ma) (Late Archean) at surface, covers 19 % of this area
Gneiss and amphibolite (Late Archean, 2.640-2.750 Ma) - Interlayered quartzofeldspathic gneiss and amphibolite in Marenisco, Mich., area and northwestern Wisconsin. Protoliths are bimodal intermediate and mafic volcanic rocks (Sims and others, 1984).
Lithology: gneiss; amphibolite
Prairie du Chien Group (Early Ordovician) at surface, covers 6 % of this area
Prairie du Chien Group
Lithology: dolostone (dolomite); sandstone; shale
Black River Limestone (Late Ordovician) at surface, covers 6 % of this area
Black River Limestone
Lithology: limestone
Trempealeau Formation (Late Cambrian) at surface, covers 8 % of this area
Trempealeau Formation
Lithology: sandstone; shale; dolostone (dolomite)
Munising Formation (Late Cambrian) at surface, covers 3 % of this area
Munising Formation
Lithology: sandstone; shale; conglomerate
Migmatitic gneiss and amphibolite (Late to Early Archean) (Archean) at surface, covers 24 % 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; migmatite; amphibolite

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