Decorah Shale 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: Decorah Shale Formation, Rocklandian to Rocklandian (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: gray shale

• Environmental call by T. Hanson.
• "[G]reenish-gray to pale-olive fossiliferous shale or claystone with lenses and think beds of coquinoidal limestone and calcareous shale." W. F. Rice. 1987. The systematics and biostratigraphy of the Brachiopoda of the Decorah Shale at St. Paul, Minnesota. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :136-166. R. E. Sloan, editor.

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 23708: 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
 Barrandeocerida - Barrandeoceratidae
Centrocyrtoceras rotundum
 Endocerida - Endoceratidae
Nanno aulema, Endoceras decorahense, Endoceras proteiforme
 Multiceratoidea - Clinoceratidae
Whitfieldoceras minimum
 Cyrtocerinida - Cyrtocerinidae
Cyrtocerina schoolcrafti
 Oncocerida - Valcouroceratidae
? Manitoulinoceras warsawense, ? Manitoulinoceras wykoffense
 Oncocerida - Oncoceratidae
? Scofieldoceras depressum
 Actinocerida - Gonioceratidae
Gonioceras kayi
 Orthocerida - Kionoceratidae
Kionoceras decorahense
 Orthocerida - Proteoceratidae
"Orthoceras junceum" = Isorthoceras junceum
"Orthoceras junceum" = Isorthoceras junceum Hall 1877
"Orthoceras" junceum
 Orthocerida - Dawsonoceratidae
Anaspyroceras anellus, Metaspyroceras perlineatum, Metaspyroceras clarkei
 Orthocerida - Orthoceratidae
Orthoceras beltrami, Michelinoceras multicameratum, Michelinoceras sp.
Orthoceras beltrami
"Orthoceras" beltrami
Michelinoceras sp. Foerste 1932