Where: Iowa, Illinois (42.0° N, 90.5° W: paleocoordinates 21.3° S, 63.6° W)
• coordinate estimated from map
• basin-level geographic resolution
When: Beecher Member (Dunleith Formation), Shermanian (457.3 - 449.6 Ma)
• member-level stratigraphic resolution
Environment/lithology: 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 23469: authorized by Steven Holland, entered by Tori Hanson on 15.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Edrioasteroidea | |
Pyrgocystis sardesoni Bather 1915 | |
Pleurocystites squamosus Billings 1874 | |
Crinoidea | |
Hybocrinus conicus Billings 1857 Sea lily | |
Cupulocrinus humilis Billings 1857 Sea lily | |
Glyptocrinus tridactylus Sea lily
Glyptocrinus sp. Hall 1847 Sea lily
Pycnocrinus sardesoni Sea lily |