Where: Illinois, Iowa (42.0° N, 90.5° W: paleocoordinates 21.0° S, 61.8° W)
• coordinate estimated from map
• basin-level geographic resolution
When: Clermont Member (Scales Shale Formation), Maysvillian (450.2 - 449.6 Ma)
• member-level stratigraphic resolution
Environment/lithology: green shale
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 23522: authorized by Steven Holland, entered by Tori Hanson on 16.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Crinoidea | |
Cupulocrinus aff. gracilis Sea lily | |
"Dendrocrinus casei" = Plicodendrocrinus casei
"Dendrocrinus casei" = Plicodendrocrinus casei Meek 1871 Sea lily | |
? Dendrocrinus oswegoensis Sea lily
Dendrocrinus sp. Hall 1852 Sea lily | |
Carabocrinus slocomi Sea lily
Porocrinus fayettensis Sea lily | |
Calceocrinus levorsoni Sea lily | |
Iocrinus sp. Hall 1866 Sea lily | |
Sygcaulocrinus typus Ulrich 1925 Sea lily
Ectenocrinus raymondi Sea lily | |
Archaeocrinus obconicus crinoid | |
Cyclocystoidea | |
Apycnodiscus sp. Smith and Paul 1982 |