Spechts Ferry Formation Echinoderms, Upper Mississippi Valley (Ordovician to of the United States)

Where: Illinois, Iowa (42.0° N, 90.5° W)

• Paleocoordinates: 11.7° S, 115.3° W (Wright 2013)

• coordinate estimated from map

• basin-level geographic resolution

When: Spechts Ferry Formation, Blackriveran to Blackriveran (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: pyritic, green shale

• Environmental call by T. Hanson.
• "[D]ark-green to green-gray, thin-bedded, soft, locally pyritic shale interbedded with fine- to medium-grained argillaceous limestone." Lithology from O. L. Karklins. 1987. Bryozoa from Rocklandian (Middle Ordovician) rocks of the Upper Mississippi Valley region. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :173-176. R. E. Sloan, ed.

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 23454: authorized by Steven Holland, entered by Tori Hanson on 15.07.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Pyrgocystites sardesoni, Willmanocysis denticulatus
Edrioasteroidea
  - Hemicystitidae
Hemicystites curtus, Hemicystites paulianus
 Isorophida - Agelacrinitidae
Agelacrinites sp.
Agelacrinites sp. Vanuxem 1842
Crinoidea
 Camerata - Reteocrinidae
Reteocrinus rocktonensis
 Monobathrida - Glyptocrinidae
Glyptocrinus pustulosis, Abludoglyptocrinus charltoni
 Flexibilia - Cupulocrinidae
Cupulocrinus conjugans, Cupulocrinus gracilis, Cupulocrinus jewetti, Cupulocrinus plattevillensis, "? Dendrocrinus springeri" = Quienquecaudex springeri
"? Dendrocrinus springeri" = Quienquecaudex springeri Kolata 1975 Sea lily
 Dendrocrinida - Dendrocrinidae
Dendrocrinus sp.
Dendrocrinus sp. Hall 1852 Sea lily
 Porocrinida -
Porocrinus pentagonius
 Homocrinida - Cincinnaticrinidae
Isotomocrinus minutus
 Rhombifera - Pleurocystitidae
Amecystis woodi, Pleurocystites squamosus
Amecystis woodi Broadhead and Strimple 1975
Pleurocystites squamosus Billings 1874
Asteroidea
 Hadrosida - Urasterellidae
"Promopalaeaster wilsoni" = Pegoasterella pompom
"Promopalaeaster wilsoni" = Pegoasterella pompom Blake and Koniecki 2020 sea star
Stylophora
 Mitrata -
Ateleocystites guttenbergensis
Cyclocystoidea
  - Cyclocystoididae
Cyclocystoides sp.
Cyclocystoides sp. Salter and Billings 1858