Maquoketa Formation, Clermont Member Echinoderms, Upper Mississippi Valley (Ordovician of the United States)

Where: Minnesota (44.0° N, 92.0° W: paleocoordinates 18.9° S, 61.1° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Clermont Member (Maquoketa Formation), Maysvillian (450.2 - 449.6 Ma)

• member-level stratigraphic resolution

Environment/lithology: limestone

• Environmental call by T. Hanson.
• Shaly limestone. Lithology from F. M. Swain. 1987. Middle and Upper Ordovician Ostracoda of Minnesota and Iowa. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :99-101.

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 23410: authorized by Steven Holland, entered by Tori Hanson on 14.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Crinoidea
 Diplobathrida - Rhodocrinitidae
 Flexibilia - Cupulocrinidae
Cupulocrinus aff. latibrachiatus Billings 1857 Sea lily
 Porocrinida -
 Dendrocrinida - Dendrocrinidae
Dendrocrinus sp. Hall 1852 Sea lily
 Cladida - Plicodendrocrinidae
"Dendrocrinus casei" = Plicodendrocrinus casei
"Dendrocrinus casei" = Plicodendrocrinus casei Meek 1871 Sea lily
 Calceocrinida - Calceocrinidae
 Homocrinida - Homocrinidae
Sygcaulocrinus typus Ulrich 1925 Sea lily
Cyclocystoidea
  - Cyclocystoididae
Apycnodiscus sp. Smith and Paul 1982