Sardeson Collection, Dubuque Formation (Ordovician of the United States)

Where: Minnesota (45.0° N, 93.3° W: paleocoordinates 17.8° S, 62.8° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Amorphognathus superbus graptolite zone, Dubuque Formation, Edenian (451.0 - 450.2 Ma)

• Beds numbered by F. W. Sardeson.

• bed-level stratigraphic resolution

Environment/lithology: argillaceous wackestone

• 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.

Size class: macrofossils

Primary reference: W. F. Rice and E. P. Hedblom. 1987. Brachiopods and trilobites of the Sardeson Beds in the Twin Cities. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 131-135 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23281: authorized by Steven Holland, entered by Tori Hanson on 11.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Lingulata
 Lingulida - Discinidae
Orbiculoidea pelopea
 Lingulida - Pseudolingulidae
? Pseudolingula iowensis
 Lingulida - Lingulasmatidae
"Lingula philomela" = Lingulasma philomela
"Lingula philomela" = Lingulasma philomela Billings 1865
"Lingula" philomela
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
"Lepidocyclus capax" = Hiscobeccus capax
"Lepidocyclus capax" = Hiscobeccus capax Conrad 1842
 Orthida - Glyptorthidae
Glyptorthis bellarugosa
 Orthida - Plaesiomyidae
Austinella kankakensis, Plaesiomys proavita
Austinella kankakensis McChesney 1861
Plaesiomys proavita Winchell and Schuchert 1892
 Orthida - Heterorthidae
"? Eremotrema emacerata" = Heterorthina emacerata
"? Eremotrema emacerata" = Heterorthina emacerata Hall 1860
 Orthida - Dalmanellidae
Paucicrura corpulenta, ? Onniella porrecta
Paucicrura corpulenta Sardeson 1892
Strophomenata
 Strophomenida - Strophomenidae
"Strophomena cf. fluctuosa" = Nasutimena fluctuosa, "Strophomena trilobita" = Strophomena trilobata
"Strophomena cf. fluctuosa" = Nasutimena fluctuosa Billings 1860
"Strophomena trilobita" = Strophomena trilobata Owen 1852
 Strophomenida - Rafinesquinidae
Rafinesquina nitans, Rafinesquina deltoidea
 Strophomenida - Furcitellidae
Megamyonia unicostata
Megamyonia unicostata Meek and Worthen 1868
 Strophomenida - Sowerbyellidae
Sowerbyella minnesotensis
 Orthotetida - Triplesiidae
Oxoplecia ulrichi
Trilobita
 Corynexochida - Illaenidae
Bumastus orbicaudatus
Bumastus orbicaudatus Billings 1859 trilobite
 Asaphida - Asaphidae
Isotelus gigas, Isotelus susae
Isotelus gigas Dekay 1824 trilobite
Isotelus susae Whitfield 1882 trilobite
 Phacopida - Calymenidae
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria Conrad 1841 trilobite
 Phacopida - Cheiruridae
Ceraurinus icarus
Ceraurinus icarus Billings 1860 trilobite