Fort Atkinson Limestone Echinoderms, Upper Mississippi Valley (Illinois, Iowa) (Ordovician of the United States)

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

• Environmental call by T. Hanson.
• Lithology from C. O. Leverson, A. J. Gerk, R. E. Sloan, & L. A. Bisagno. General section of the Middle and Late Ordovician strata of Northeastern Iowa, Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35, p.25-39. Edited by R. E. Sloan.

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
 Dendrocrinida - Dendrocrinidae
 Cladida - Plicodendrocrinidae
"Dendrocrinus casei" = Plicodendrocrinus casei
"Dendrocrinus casei" = Plicodendrocrinus casei Meek 1871 Sea lily
 Porocrinida -
 Flexibilia - Cupulocrinidae
Cupulocrinus aff. latibrachiatus Billings 1857 Sea lily
 Taxocrinida - Taxocrinidae
Protaxocrinus sp. Springer 1906 Sea lily
 Homocrinida - Homocrinidae
Sygcaulocrinus typus Ulrich 1925 Sea lily
 Myelodactylida - Iocrinidae
Iocrinus sp. Hall 1866 Sea lily
 Calceocrinida - Calceocrinidae
 Diplobathrida - Rhodocrinitidae
aff. Trichinocrinus sp. Moore and Laudon 1943 Sea lily
new genus aff. Trichinocrinus sp.
Soluta
 Syringocrinida - Iowacystidae
Edrioasteroidea
 Pentacystida - Steganoblastidae
Cyclocystoidea
  - Cyclocystoididae
Cyclocystoides sp. Salter and Billings 1858
Echinoidea
 Bothriocidaroida - Bothriocidaridae