Sardeson Collection, Spechts Ferry Formation, Illinois and Iowa (Ordovician to of the United States)

Where: Illinois, Iowa (42.0° N, 90.5° W: paleocoordinates 21.3° S, 63.6° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Spechts Ferry Formation, Blackriveran to Blackriveran (460.9 - 449.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: pyritic, green shale

• Environmental call by T. Hanson.
• "[D]ark-green to green-gray, thin-bedded, soft, locally pyritic shale interbedded with fine- to medium-grained argillaceous limestone." Lithology from O. L. Karklins. 1987. Bryozoa from Rocklandian (Middle Ordovician) rocks of the Upper Mississippi Valley region. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :173-176. R. E. Sloan, ed.

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 23795: authorized by Steven Holland, entered by Tori Hanson on 21.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Strophomenida - Sowerbyellidae
 Strophomenida - Furcitellidae
Oepikina minnesotensis Winchell 1881
Trigrammaria winchelli Hall and Clarke 1892
 Strophomenida - Strophomenidae
Rhynchonellata
 Rhynchonellida - Rhynchotrematidae
 Rhynchonellida - Trigonirhynchiidae
 Orthida - Hesperorthidae
 Orthida - Glyptorthidae
 Orthida - Plectorthidae
 Orthida - Draboviidae
 Atrypida - Protozygidae
"Protozyga nicolleti" = Manespira nicolleti
"Protozyga nicolleti" = Manespira nicolleti Winchell and Schuchert 1892
 Atrypida - Anazygidae
Craniata
 Craniida - Craniidae
"Acanthocrania setigeria" = Acanthocrania setigera Hall 1866
[entered as Acanthocrania setigera]
Lingulata
 Lingulida - Pseudolingulidae
 Lingulida - Obolidae
 Lingulida - Discinidae
 Lingulida - Trematidae
Trematis huronensis Billings 1865
 Siphonotretida - Siphonotretidae
Schizambon sp. Walcott 1884
Trilobita
 Lichida - Lichidae
Amphilichas sp. Raymond 1905 trilobite
 Asaphida - Asaphidae
Isotelus gigas Dekay 1824 trilobite
Isotelus simplex Raymond and Narraway 1910 trilobite
 Corynexochida - Illaenidae
Thaleops ovata Conrad 1843 trilobite
Illaenus sp. Dalman 1827 trilobite
Bumastoides sp. Whittington 1954 trilobite
 Proetida - Bathyuridae
"Raymondites longispinus" = Bathyurus (Raymondites) longispinus
"Raymondites longispinus" = Bathyurus (Raymondites) longispinus Walcott 1876 trilobite
 Phacopida - Cheiruridae
 Phacopida - Pterygometopidae
Eomonorachus intermedius Walcott 1879 trilobite