Dubuque Formation Echinoderms, Upper Mississippi Valley (Minnesota) (Ordovician of the United States)

Where: Minnesota (44.0° N, 92.0° W: paleocoordinates 19.1° S, 62.9° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Dubuque Formation, Edenian (451.0 - 450.2 Ma)

• formation-level stratigraphic resolution

Environment/lithology: argillaceous wackestone

• Environmental call by T. Hanson.
• Lithology from W. F. Rice and E. P. Hedblom. 1987. Brachiopods and trilobites of the Sardeson Beds in the Twin Cities. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :131-135.

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 23408: authorized by Steven Holland, entered by Tori Hanson on 14.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Glyptocystitid sp. n. gen.
New glyptocystitid genus
 Rhombifera - Pleurocystitidae
Amecystis sp. Ulrich and Kirk 1921
Cyclocystoidea
  - Cyclocystoididae
Actinodiscus sp. Smith and Paul 1982
Cyclocystoides sp. Salter and Billings 1858