Maquoketa Formation Pelecypods, Upper Mississippi Valley (Ordovician to of the United States)

Where: Minnesota, Iowa, Wisconsin, Illinois (42.5° N, 91.3° W: paleocoordinates 20.6° S, 63.7° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Maquoketa Formation, Edenian to Edenian (451.0 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: shale and limestone

• Environmental call by T. Hanson.
• Shale interbedded with limestone; sometimes dolomitic. Lithology from F. M. Swain. 1987. Middle and Upper Ordovician Ostracoda of Minnesota and Iowa. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :99-101. Edited by R. E. Sloan.

Size class: macrofossils

Collection methods: "Where possible, stratigraphic information is taken from museum labels; where this is not possible, it is taken from Bassler (1915)."

Primary reference: J., J.r. Pojeta. 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 [S. Holland/T. Hanson/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23554: authorized by Steven Holland, entered by Tori Hanson on 16.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Nuculanida - Cucullellidae
Nuculites sp.
Nuculites sp. Conrad 1841 clam
 Nuculanida - Malletiidae
Palaeoneilo sp.
Palaeoneilo sp. Hall and Whitfield 1869 clam
 Nuculida - Praenuculidae
Similodonta sp.
Similodonta sp. Soot-Ryen 1964 clam
 Modiomorphida - Modiomorphidae
Modiolopsis sp., Saffordia sp., Orthodesma sp.
Modiolopsis sp. Hall 1847 clam
Saffordia sp. Ulrich 1894 clam
Orthodesma sp. Hall and Whitfield 1875 clam
 Myalinida - Ambonychiidae
Ambonychia sp.
Ambonychia sp. Hall 1847 clam
 Ostreida - Pterineidae
Pterinea sp.
Pterinea sp. Goldfuss 1832 oyster
"Pterinea"
 Cyrtodontida - Cyrtodontidae
Cyrtodonta sp., Cyrtodontula sp.
Cyrtodonta sp. Billings 1858 clam
Cyrtodontula sp. Tomlin 1931 clam