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: Buckhorn Member (Ion Formation), Kirkfieldian (460.9 - 449.5 Ma)
• member-level stratigraphic resolution
Environment/lithology: 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 23797: authorized by Steven Holland, entered by Tori Hanson on 21.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Strophomenata | |
Sowerbyella curdsvillensis Foerste 1912 | |
Oepikina minnesotensis Winchell 1881 | |
Rafinesquina trentonensis Hall 1847 | |
Strophomena filitexta, Strophomena septata, "Bellimurina charlottae" = Bellimurina (Bellimurina) charlottae
Strophomena filitexta Hall 1847
Strophomena septata Winchell and Schuchert 1892
"Bellimurina charlottae" = Bellimurina (Bellimurina) charlottae Winchell and Schuchert 1892 | |
Rhynchonellata | |
"Plaesiomys meedsi" = Dinorthis meedsi
"Plaesiomys meedsi" = Dinorthis meedsi Winchell and Schuchert 1892 | |
Hesperorthis tricenaria Conrad 1843 | |
Glyptorthis bellarugosa Conrad 1843 | |
Platystrophia amoena McEwan 1919
Platystrophia trentonensis McEwan 1919 | |
Skenidioides anthonense Sardeson 1894 | |
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847 | |
Craniata | |
| |
Lingulata | |
? Pseudolingula iowensis Owen 1844 | |
Trematis huronensis Billings 1865 | |
Trilobita | |
Isotelus gigas Dekay 1824 trilobite | |
Thaleops sp. Conrad 1843 trilobite
Bumastoides porrectus trilobite | |
"Acanthoparypha evetti" = Acanthoparypha evitti
"Acanthoparypha evetti" = Acanthoparypha evitti Chatterton and Ludvigsen 1976 trilobite | |
Sceptaspis lincolnensis Branson 1909 trilobite
Eomonorachus intermedius Walcott 1879 trilobite |