Quimbys Mill Formation Echinoderms, Upper Mississippi Valley (Ordovician 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: Quimbys Mill Formation, Blackriveran (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: limestone

• Environmental call by T. Hanson
• "12 to 14 feet thick . . . medium to thin beds of limestone and dolomite separated by thin shale laminae." 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 23449: 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
  -
"Cincinnaticrinid" sp.
"Cincinnaticrinid" sp.
Cincinnaticrinid
 Rhombifera - Pleurocystitidae
Amecystis woodi, Pleurocystites squamosus
Amecystis woodi Broadhead and Strimple 1975
Pleurocystites squamosus Billings 1874
Crinoidea
 Monobathrida - Glyptocrinidae
Abludoglyptocrinus charltoni
 Inadunata - Merocrinidae
Merocrinus britonensis
 Flexibilia - Cupulocrinidae
Cupulocrinus gracilis
 Dendrocrinida - Dendrocrinidae
Dendrocrinus sp.
Dendrocrinus sp. Hall 1852 Sea lily
 Porocrinida -
Porocrinus pentagonius, Porocrinus smithi, Carabocrinus sp.
Carabocrinus sp. Billings 1857 Sea lily
 Calceocrinida - Calceocrinidae
Cremacrinus arctus, Cremacrinus sp., Anulocrinus forrestonensis
Cremacrinus sp. Ulrich 1886 Sea lily
Edrioasteroidea
  - Pyrgocystidae
Pyrgocystis sardesoni
 Isorophida - Agelacrinitidae
Agelacrinites sp.
Agelacrinites sp. Vanuxem 1842
  - Hemicystitidae
Hemicystites paulianus