Stratigraphic range: Darriwilian-Hirnantian (Edenian-Richmondian) 461–444 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
Type
Formation
Unit of
Maquoketa Group
Sub-units
Brainard, Clermont & Elgin members
Underlies
Thebes Formation & Wapsipinicon Group
Overlies
Cape & Dubuque Formations
Thickness
10–100 ft (3.0–30.5 m)
Lithology
Primary
Shale, dolomite
Other
Limestone, phosphorite
Location
Coordinates
42°30′N91°18′W / 42.5°N 91.3°W / 42.5; -91.3
Approximate paleocoordinates
20°36′S63°42′W / 20.6°S 63.7°W / -20.6; -63.7
Region
Minnesota Wisconsin Illinois Iowa Kentucky Kansas
Country
United States
Extent
Illinois Basin
Maquoketa Formation (the United States)
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Maquoketa Formation (Iowa)
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The Maquoketa Formation is a geologic formation in Illinois,[1] Indiana.[2] Iowa, Kansas,[3] Minnesota,[4] Missouri,[5] and Wisconsin.[6] It preserves mollusk, coral, brachiopod and graptolite fossils[5] dating back to the Darriwilian to Hirnantian stages (Edenian to Richmondian in the regional stratigraphy) of the Ordovician period.[7]
^A comparison of the Maquoketa formation and its fauna in Eastern Wisconsin, Iowa and Illinois (1915), Thesis (M.A.) The University of Illinois
The MaquoketaFormation is a geologic formation in Illinois, Indiana. Iowa, Kansas, Minnesota, Missouri, and Wisconsin. It preserves mollusk, coral, brachiopod...
The Hunton Megagroup also Hunton Super Group, Hunton Group, Hunton Formation and Hunton Limestone is predominantly composed of carbonate rock, deposited...
Edgewood Dolomite overlying strata of the Ordovician MaquoketaFormation. The MaquoketaFormation consists of dark-gray clayey siltstone and silty dolomite...
Maquoketa Caves State Park is a state park of Iowa, United States, located in Jackson County. It stands northwest of the city of Maquoketa. In 1991 111...
Kinkaid formation to the west. Mt. Pleasant Sandstone, Bristow Sandstone, and Siberia Limestone. The Siberia is a thin tongue of the Menard formation. This...
quartz pebbles, as well as a matrix of quartz sand. The Wilcox Formation is a sand formation that is part of the Embayment Megagroup. It runs from southern...
use. The Petersburg formation also contains sandstone members that are used as aquifers. The Linton Formation is a geologic formation in Indiana. It is...
The Knox Supergroup, also known as the Knox Group and the Knox Formation, is a widespread geologic group in the Southeastern United States. The age is...
underlies the Antrim Shale. The North Vernon Limestone is a geologic formation in Indiana. Also called the Sellersburg Limestone, this term however is...
The Munising Group or Formation is a 1,700 feet (520 m) thick, white to light grey Cambrian sedimentary unit that crops out in Michigan and (to a lesser...
The Maquoketa Group is an assemblage of several geologic formations. It is Upper Ordovician in age and named for the Maquoketa River in Iowa. It exists...
The Paoli Formation, Paoli Limestone, or Paoli Chert is a geologic formation in Indiana, Illinois, Kentucky and Missouri. This formation contains members...
The Milwaukee Formation is a fossil-bearing geological formation of Middle Devonian age in Milwaukee County, Wisconsin. It stands out for the exceptional...
Beaver Bay Complex, and the associated North Shore Volcanic Group are rock formations which comprise much of the basement bedrock of the northeastern part of...
The Rove Formation is a sedimentary rock formation of Middle Precambrian age underlying the upper northeastern part of Cook County, Minnesota, United...
Limestones, late Ordovician Maquoketaformation, early Silurian Bainbridge Group limestones, as well as early Devonian Bailey Formation limestones have all been...
Harmony Group is located in the State of Indiana. It is made up of three formations, the Grassy Knob Chert, the Backbone Limestone and Clear Creek Chert....
The Dubuque Formation is a geologic formation in Illinois, Iowa, Wisconsin and Minnesota. It preserves fossils dating back to the Ordovician period. List...
The Coralville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period. Earth sciences portal Iowa portal Paleontology...
The Glenwood Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. Earth sciences portal Illinois...
The Leemon Formation is a geologic formation in Missouri. It preserves fossils dating back to the Ordovician period. Earth sciences portal United States...
The Stewartville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Ordovician period. Earth sciences portal Iowa portal...
The Neda Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. Earth sciences portal Illinois portal...
limestone as well as the shale and dolomite of the MaquoketaFormation which is overlain by the Neda Formation oolite iron oxides. A narrow band along the Lake...
The Spillville Formation is a geologic formation in Iowa. It preserves fossils dating back to the Devonian period. Earth sciences portal Iowa portal Paleontology...
The Cummingsville Formation is a geologic formation in Iowa and Minnesota. It preserves fossils dating back to the Ordovician period. Earth sciences portal...
The Pecatonica Formation is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period. List of fossiliferous stratigraphic...
The Paint Creek Formation is a geologic formation in Illinois. It preserves fossils dating back to the Carboniferous period. Earth sciences portal Illinois...
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Minnesota
Wisconsin
Illinois
Iowa
Kentucky
Kansas
United States
