Ion Formation, Buckhorn Member Cephalopods, Illinois, Iowa, Wisconsin (Ordovician of the United States)

Where: Illinois, Iowa, Wisconsin (43.0° N, 91.0° W: paleocoordinates 20.4° S, 63.1° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Buckhorn Member (Ion Formation), Kirkfieldian (457.3 - 449.6 Ma)

• member-level stratigraphic resolution

Environment/lithology: limestone

• Environmental call by T. Hanson.
• 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 23766: 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.
Show authors, comments, and common names
Cephalopoda
 Oncocerida - Oncoceratidae
? Scofieldoceras depressum
 Oncocerida - Valcouroceratidae
? Manitoulinoceras warsawense, ? Manitoulinoceras wykoffense
 Orthocerida - Orthoceratidae
Michelinoceras multicameratum, Michelinoceras sp., Orthoceras beltrami
Michelinoceras sp. Foerste 1932
Orthoceras beltrami
"Orthoceras" beltrami
 Orthocerida - Proteoceratidae
"Orthoceras junceum" = Isorthoceras junceum
"Orthoceras junceum" = Isorthoceras junceum Hall 1877
"Orthoceras" junceum
 Orthocerida - Dawsonoceratidae
Metaspyroceras perlineatum, Metaspyroceras clarkei, Anaspyroceras anellus
 Actinocerida - Gonioceratidae
Gonioceras kayi
 Endocerida - Endoceratidae
Endoceras decorahense, Nanno aulema