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: Wall Member (Dunleith Formation), Shermanian (460.9 - 449.5 Ma)
• member-level stratigraphic resolution
Environment/lithology: argillaceous limestone
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 23805: authorized by Steven Holland, entered by Tori Hanson on 21.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Strophomenata | |
Sowerbyella minnesotensis Sardeson 1892 | |
Rafinesquina deltoidea Conrad 1838 | |
"Strophomena trilobita" = Strophomena trilobata
"Strophomena trilobita" = Strophomena trilobata Owen 1852 | |
Rhynchonellata | |
"Lepidocyclus capax" = Hiscobeccus capax
"Lepidocyclus capax" = Hiscobeccus capax Conrad 1842 | |
"Plaesiomys meedsi" = Dinorthis meedsi
"Plaesiomys meedsi" = Dinorthis meedsi Winchell and Schuchert 1892 | |
Hesperorthis tricenaria Conrad 1843 | |
Glyptorthis bellarugosa Conrad 1843 | |
Paucicrura rogata Sardeson 1892 | |
Cyclospira bisulcata Emmons 1842 | |
"Zygospira recurvirostris" = Anazyga recurvirostra, Zygospira uphami
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847 | |
Lingulata | |
? Pseudolingula iowensis Owen 1844 | |
Trilobita | |
Isotelus gigas Dekay 1824 trilobite | |
Illaenus sp. Dalman 1827 trilobite | |
"Encrinuroides vigilans" = Erratencrinurus vigilans
"Encrinuroides vigilans" = Erratencrinurus vigilans Hall 1847 trilobite | |
Ceraurus pleurexanthemus Green 1832 trilobite |