Fort Atkinson Limestone Echinoderms, Upper Mississippi Valley (Illinois, Iowa): Maysvillian, Illinois, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Echinoidea - Bothriocidaroida - Bothriocidaridae
Edrioasteroidea - Edrioblastoida - Steganoblastidae
Cyclocystoidea - Cyclocystoididae
Cyclocystoides sp. Salter and Billings 1858
Crinoidea - Myelodactylida - Iocrinidae
Iocrinus sp. Hall 1866
Crinoidea - Calceocrinida - Calceocrinidae
Crinoidea - Homocrinida - Homocrinidae
Crinoidea - Taxocrinida - Taxocrinidae
Protaxocrinus sp. Springer 1906
Crinoidea - Cupulocrinidae
Crinoidea - Dendrocrinida - Dendrocrinidae
Crinoidea - Plicodendrocrinidae
Crinoidea - Porocrinida
Crinoidea - Diplobathrida - Rhodocrinitidae
aff. Trichinocrinus sp. Moore and Laudon 1943
new genus aff. Trichinocrinus sp.
Soluta - Syringocrinida - Iowacystidae
see common names

Geography
Country:United States State/province:Illinois, Iowa
Coordinates: 42.0° North, 93.5° West (view map)
Paleocoordinates:15.2° South, 118.5° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:basin
Time
Period: Ordovician Epoch: Late Ordovician
Stage: Katian 10 m.y. bin: Ordovician 5
*Period:Late/Upper Ordovician *Local age/stage:Maysvillian
Key time interval: Maysvillian
Age range of interval: 450.2 - 449.6 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Maquoketa Formation:Fort Atkinson Limestone
Stratigraphic resolution:formation
Lithology and environment
Primary lithology:dolomitic argillaceous "limestone"
Includes fossils?Y
Lithology description: 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.
Environment:carbonate indet.
Geology comments: Environmental call by T. Hanson.
Taphonomy
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:23524
Authorizer:S. Holland Enterer:T. Hanson
Modifier:T. Hanson Research group:marine invertebrate
Created:2002-07-16 09:17:57 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-07-16 09:17:57
Creative Commons license:CC0
Reference information

Primary reference:
6707. 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]