Maquoketa Formation, Elgin Member Cephalopods, Minnesota (Ordovician to of the United States)

Where: Minnesota (45.0° N, 93.0° W: paleocoordinates 17.9° S, 62.6° W)

• coordinate estimated from map

• basin-level geographic resolution

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

• member-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

Primary reference: 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 [S. Holland/T. Hanson/S. Bruning]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23741: authorized by Steven Holland, entered by Tori Hanson on 19.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Faunal list compiled from: 1. Whitfield's (1882) report in volume 4 of Chamberlin's Geology of Wisconsin 2. Clarke's (1897) report in volume III part 2 of Winchell's Final Reports of the Minnesota Geological and Natural History Survey 3. Bassler's Index 4. Individual articles (Foerste, Flower, etc.) 5. Treatise, Part K 6. Author's personal field data.
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Cephalopoda
 Barrandeocerida - Barrandeoceratidae
Centrocyrtoceras rotundum
 Oncocerida - Oncoceratidae
Beloitoceras grafense, Beloitoceras whitneyi
 Multiceratoidea - Clinoceratidae
Whitfieldoceras minimum
 Ascocerida - Probillingsitidae
Probillingsites pronis
 Multiceratoidea - Apsidoceratidae
Charactoceras laddi, Deckeroceras clermontense
 Dissidocerida - Geisonoceratidae
? Geisonoceras clermontense
 Orthocerida - Dawsonoceratidae
Anaspyroceras calvini, Anaspyroceras clermontense, Anaspyroceras perroti
 Orthocerida - Kionoceratidae
Kionoceras postvillense, Kionoceras tenuitectum, Kionoceras thomasi, Kionoceras decorahense, Polygrammoceras sp.
Polygrammoceras sp. Foerste 1927
 Orthocerida - Proteoceratidae
Isorthoceras sociale, Ephippiorthoceras laddi, Ephippiorthoceras tenuistriatum
Isorthoceras sociale Hall in Miller 1877
 Actinocerida - Ormoceratidae
? Ormoceras maquoketense
 Actinocerida - Armenoceratidae
Armenoceras clermontense, Armenoceras iowense
 Endocerida - Endoceratidae
Endoceras atkinsonense, Endoceras clermontense, Endoceras kayi, Endoceras thomasi, ? Endoceras fulgar