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: Mifflin Formation, Blackriveran (457.3 - 449.6 Ma)
• formation-level stratigraphic resolution
Environment/lithology: argillaceous limestone
Size class: macrofossils
Primary reference: D. R. Kolata, J. C. Brower, and T. J. Frest. 1987. Upper Mississippi Valley Champlainian and Cincinnatian echinoderms. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 179-181 [S. Holland/T. Hanson/T. Hanson]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 23431: authorized by Steven Holland, entered by Tori Hanson on 15.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
| unclassified | |
|
| |
| Echinoidea | |
|
Bothriocidaris solemi sea urchin | |
|
Neobothriocidaris sp. sea urchin | |
| Asteroidea | |
"Urasterella ulrichi" = Ulrichaster ulrichi, Urasterella sp.
"Urasterella ulrichi" = Ulrichaster ulrichi Schuchert 1915 sea star
Urasterella sp. McCoy 1851 sea star | |
|
Hudsonaster narrawayi Hudson 1912 sea star | |
| Crinoidea | |
|
Porocrinus pentagonius Sea lily | |
"Reteocrinus spinosus" = Reteocrinus, "Traskocrinus mahlburgi" = Reteocrinus
"Reteocrinus spinosus" = Reteocrinus Sea lily
"Traskocrinus mahlburgi" = Reteocrinus Sea lily | |
|
Rhaphanocrinus buckleyi crinoid | |
|
Abludoglyptocrinus charltoni Sea lily | |
|
Praepleurocystis sp. Paul 1967 | |
| Cyclocystoidea | |
|
Cyclocystoides sp. Salter and Billings 1858
Cyclocystoides halli Billings 1858 | |