Maquoketa Formation Explained

Maquoketa Formation
Type:	Formation
Age:	Darriwilian-Hirnantian (Edenian-Richmondian)
Period:	Late Ordovician
Prilithology:	Shale, dolomite
Otherlithology:	Limestone, phosphorite
Region:
Coordinates:	42.5°N -91.3°W
Paleocoordinates:	-20.6°N -63.7°W
Unitof:	Maquoketa Group
Subunits:	Brainard, Clermont & Elgin members
Underlies:	Thebes Formation & Wapsipinicon Group
Overlies:	Cape & Dubuque Formations
Thickness:	10-
Extent:	Illinois Basin

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]

Further reading

• T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783
• R. J. Elias and D. Lee. 1993. Microborings and growth in Late Ordovician halysitids and other corals. Journal of Paleontology 67(6):922-934
• J. A. Catalani. 1987. Biostratigraphy of the Middle and Late Ordovician cephalopods of the Upper Mississippi Valley area. In R. E. Sloan (ed.), Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 187-189
• J. Pojeta, Jr. 1987. Ordovician pelecypods from the Upper Mississippi Valley. In R. E. Sloan (ed.), Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 182-182
• R. E. Sloan and G. F. Webers. 1987. Stratigraphic ranges of Middle and Late Ordovician Gastropoda and Monoplacophora of Minnesota. In R. E. Sloan (ed.), Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 183-186
• F. M. Swain. 1987. Middle and Upper Ordovician Ostracoda of Minnesota and Iowa. In R. E. Sloan (ed.), Minnesota Geological Survey Report of Investigations 35:99-101
• W. C. Parker. 1983. Fossil ecological successions in Paleozoic level bottom brachiopod-bryozoan communities. 1-217
• J. K. Rigby and T. N. Bayer. 1971. Sponges of the Ordovician Maquoketa Formation in Minnesota and Iowa. Journal of Paleontology 45(4):608-627
• A. K. Miller, W. Youngquist, and C. Collinson. 1954. Ordovician cephalopod fauna of Baffin Island. Geological Society of America Memoir 62:1-234
• Y. Wang. 1949. Maquoketa Brachiopoda of Iowa. Geological Society of America Memoir 42:1-55
• A. F. Foerste. 1924. Upper Ordovician faunas of Ontario and Quebec. Geological Survey of Canada Memoir 138(121):1-99

Notes and 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. http://igs.indiana.edu/compendium/comp5kmc.cfm Maquoketa Group, Indiana Geological Survey
3. http://www.kgs.ku.edu/Publications/Bulletins/189/05_ordo.html Ordovician in Kansas
4. http://www.midwestpaleo.com/Formations/Maquoketa/Maquoketa.htm Maquoketa Formation in Minnesota
5. The Stratigraphic Succession in Missouri, Missouri Geological Survey, Vol. XL 2nd series, 1961, pp 30-31
6. http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=WIOm;0 USGS, Maquoketa Formation
7. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayStrata&geological_group=&formation=Maquoketa&group_formation_member=Maquoketa Maquoketa Formation