ammonites
Dubuque Formation Gastropoda and Monoplacophora, Minnesota (Ordovician of the United States)

Where: Minnesota (46.0° N, 94.0° W: paleocoordinates 16.8° S, 62.3° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Dubuque Formation, Edenian (460.9 - 449.5 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. Edited by R. E. Sloan.

Size class: macrofossils

Collection methods: "[B]ased on a review of the Sardeson Collection at the University of Minnesota, Weiss (1953), Ulrich and Scofield (1895), the unpublished work of Levorson and Gerk, and the list in Stauffer and Thiel (1941)."

Primary reference: R. E. Sloan and G. F. Webers. 1987. Stratigraphic ranges of Middle and Late Ordovician Gastropoda and Monoplacophora of Minnesota. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 183-186 [S. Holland/T. Hanson/T. Hanson] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23597: authorized by Steven Holland, entered by Tori Hanson on 17.07.2002