Sardeson Collection, Scales Shale, Clermont Member, Illinois and Iowa (Ordovician of the United States)

Where: Illinois, Iowa (42.0° N, 90.5° W: paleocoordinates 21.0° S, 61.8° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Clermont Member (Scales Shale Formation), Maysvillian (450.2 - 449.6 Ma)

• member-level stratigraphic resolution

Environment/lithology: green shale

• Environmental call by T. Hanson.
• Shale, bluish-green. Lithology from Lithology from C. O. Leverson, A. J. Gerk, R. E. Sloan, & L. A. Bisagno. General section of the Middle and Late Ordovician strata of Northeastern Iowa, Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35, p.25-39. 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 23811: authorized by Steven Holland, entered by Tori Hanson on 21.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Asaphida - Asaphidae
Isotelus susae
Isotelus susae Whitfield 1882 trilobite
Rhynchonellata
 Orthida - Plaesiomyidae
Plaesiomys proavita, Austinella kankakensis
Plaesiomys proavita Winchell and Schuchert 1892
Austinella kankakensis McChesney 1861
 Orthida - Glyptorthidae
Glyptorthis bellarugosa
 Orthida - Plectorthidae
Hebertella occidentalis
 Orthida - Heterorthidae
"? Eremotrema emacerata" = Heterorthina emacerata
"? Eremotrema emacerata" = Heterorthina emacerata Hall 1860
 Orthida - Dalmanellidae
Paucicrura corpulenta, Paucicrura rogata, ? Onniella porrecta
Paucicrura corpulenta Sardeson 1892
Paucicrura rogata Sardeson 1892
 Atrypida - Anazygidae
Zygospira modesta
 Rhynchonellida - Rhynchotrematidae
"Lepidocyclus capax" = Hiscobeccus capax, Hypsiptycha anticostiensis
"Lepidocyclus capax" = Hiscobeccus capax Conrad 1842
Strophomenata
 Strophomenida - Furcitellidae
Megamyonia unicostata
Megamyonia unicostata Meek and Worthen 1868
 Strophomenida - Rafinesquinidae
Rafinesquina trentonensis, Rafinesquina deltoidea
 Strophomenida - Strophomenidae
Tetraphalerella planodorsata, "Strophomena trilobita" = Strophomena trilobata
Tetraphalerella planodorsata Winchell and Schuchert 1892
"Strophomena trilobita" = Strophomena trilobata Owen 1852
 Strophomenida - Sowerbyellidae
"Eoplectodonta recedens" = Thaerodonta recedens
"Eoplectodonta recedens" = Thaerodonta recedens Sardeson 1892
Lingulata
 Lingulida - Discinidae
Orbiculoidea pelopea