Where: Illinois, Iowa (42.0° N, 93.5° W: paleocoordinates 19.4° S, 63.5° W)
• coordinate estimated from map
• basin-level geographic resolution
When: Fort Atkinson Limestone Formation (Maquoketa Group), Maysvillian (452.0 - 449.5 Ma)
• formation-level stratigraphic resolution
Environment/lithology: dolomitic, 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 23524: authorized by Steven Holland, entered by Tori Hanson on 16.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Crinoidea | |
Dendrocrinus oswegoensis Sea lily | |
"Dendrocrinus casei" = Plicodendrocrinus casei
"Dendrocrinus casei" = Plicodendrocrinus casei Meek 1871 Sea lily | |
Carabocrinus slocomi Sea lily
Porocrinus fayettensis Sea lily | |
Cupulocrinus aff. latibrachiatus Billings 1857 Sea lily | |
Protaxocrinus sp. Springer 1906 Sea lily | |
Ectenocrinus raymondi Sea lily
Sygcaulocrinus typus Ulrich 1925 Sea lily | |
Iocrinus sp. Hall 1866 Sea lily | |
Calceocrinus levorsoni Sea lily | |
Archaeocrinus obconicus Sea lily | |
Soluta | |
Edrioasteroidea | |
Cyclocystoidea | |
Cyclocystoides sp. Salter and Billings 1858 | |
Echinoidea | |
Bothriocidaris maquoketensis sea urchin |