St. Peter Sandstone of Southeastern Minnesota: Daytons Bluff (Ordovician of the United States)

Where: Minnesota (45.0° N, 93.1° W: paleocoordinates 17.9° S, 62.7° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: St. Peter Sandstone Formation, Blackriveran (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: coastal; sandstone

• Siliciclastic indet., probably shallow coastal: very shallow water, perhaps 15 feet deep. Environmental call by T. Hanson.
• "[W]ell-sorted, well-rounded, fine to medium quartz sand and rare thin beds of shale and coarse sand (Duke, 1921; Thiel, 1935)." From J.M. Mazullo and R. Ehrlich, 1987. "The St. Peter Sandstone of Southeastern Minnesota: mode of deposition." Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Saint Paul, Minnesota Geological Survey Report of Investigations 35, p. 44-50. R. E. Sloan, ed.

Size class: macrofossils

Primary reference: R. E. Sloan. 1987. The St. Peter Sandstone of Southeastern Minnesota: Fauna. Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35:50-51 [S. Holland/T. Hanson/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23083: authorized by Steven Holland, entered by Tori Hanson on 09.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Modiomorphida - Modiomorphidae
Orthodesma litoralis, Modiolopsis gregalis
 Cyrtodontida - Cyrtodontidae
Cyrtodonta descriptus, Cyrtodonta dignus
 Solemyida - Ctenodontidae
Ctenodonta novicea