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
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 | |
Sowerbyella curdsvillensis Foerste 1912 | |
Oepikina minnesotensis Winchell 1881
Trigrammaria winchelli Hall and Clarke 1892 | |
Strophomena cf. plattinensis Fenton 1928 | |
Rhynchonellata | |
Rostricellula minnesotensis Sardeson 1892 | |
Hesperorthis tricenaria Conrad 1843 | |
Glyptorthis bellarugosa Conrad 1843 | |
Pionodema subaequata Conrad 1843 | |
"Protozyga nicolleti" = Manespira nicolleti
"Protozyga nicolleti" = Manespira nicolleti Winchell and Schuchert 1892 | |
Zygospira lebanonensis Cooper 1956 | |
Craniata | |
Acanthocrania granulosa, "Acanthocrania setigeria" = Acanthocrania setigera, Petrocrania trentonensis
| |
Lingulata | |
? Pseudolingula iowensis Owen 1844
Pseudolingula eva Billings 1861 | |
Trematis huronensis Billings 1865 | |
Schizambon sp. Walcott 1884 | |
Trilobita | |
Amphilichas sp. Raymond 1905 trilobite | |
Isotelus gigas Dekay 1824 trilobite
Isotelus simplex Raymond and Narraway 1910 trilobite | |
Thaleops ovata Conrad 1843 trilobite
Illaenus sp. Dalman 1827 trilobite
Bumastoides sp. Whittington 1954 trilobite | |
"Raymondites longispinus" = Bathyurus (Raymondites) longispinus
"Raymondites longispinus" = Bathyurus (Raymondites) longispinus Walcott 1876 trilobite | |
Gabriceraurus mifflinensis trilobite | |
Eomonorachus intermedius Walcott 1879 trilobite |