Maquoketa Formation
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.
| Maquoketa Formation Stratigraphic range: Ordovician | |
|---|---|
| Type | Formation |
| Underlies | Thebes Formation and Wapsipinicon Group |
| Overlies | Cape Formation and Dubuque Formation |
| Thickness | 10 to 100 ft. |
| Lithology | |
| Primary | Shale |
| Other | Limestone |
| Location | |
| Region |       |
| Country |  |
| Extent | Illinois, Minnesota, and Wisconsin |
See also
References
- A comparison of the Maquoketa formation and its fauna in Eastern Wisconsin, Iowa and Illinois (1915), Thesis (M.A.) The University of Illinois
- Maquoketa Group, Indiana Geological Survey
- Ordovician in Kansas
- Maquoketa Formation in Minnesota
- The Stratigraphic Succession in Missouri, Missouri Geological Survey, Vol. XL 2nd series, 1961, pp 30-31
- USGS, Maquoketa Formation
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 22 June 2014.
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