Maquoketa Formation

Maquoketa Formation
Stratigraphic range: Ordovician
Type Formation
Underlies Thebes Formation
Overlies Cape Formation
Thickness 10 to 100 ft.
Lithology
Primary Shale
Other Limestone
Location
Country United States

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 Ordovician period.

References

  1. A comparison of the Maquoketa formation and its fauna in Eastern Wisconsin, Iowa and Illinois (1915), Thesis (M.A.) The University of Illinois
  2. Maquoketa Group, Indiana Geological Survey
  3. Ordovician in Kansas
  4. Maquoketa Formation in Minnesota
  5. 1 2 The Stratigraphic Succession in Missouri, Missouri Geological Survey, Vol. XL 2nd series, 1961, pp 30-31
  6. USGS, Maquoketa Formation


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