Where: Minnesota (44.0° N, 92.0° W: paleocoordinates 19.1° S, 62.9° W)
• coordinate estimated from map
• basin-level geographic resolution
When: Stictoporella angularis zone, Decorah Shale Formation, Rocklandian to Rocklandian (457.3 - 449.6 Ma)
• Equivalent of Spechts Ferry Shale Member in northeastern Iowa.
• formation-level stratigraphic resolution
Environment/lithology: gray shale and limestone
Size class: microfossils
Collection methods: chemical,
Primary reference: F. M. Swain and J. R. Cornell. 1987. Ostracoda of the superfamilies Drepanellacea, Hollinacea, Leperditellacea, and Healdiacea from the Decorah Shale of Minnesota. In R. E. Sloan (ed.), Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 102-130 [S. Holland/T. Hanson/S. Bruning]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 23123: authorized by Steven Holland, entered by Tori Hanson on 09.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Ostracoda | |
Dicranella bicornis ostracod | |
Winchellatia lansingensis ostracod
Winchellatia minnesotensis ostracod
? Winchellatia ceratopea n. sp. ostracod | |
Tetradella ellipsilira, Thomasatia falcicosta, Bromidella depressa, Bromidella rhomboides, Bellornatia tricollis
Tetradella ellipsilira ostracod
Thomasatia falcicosta ostracod
Bromidella depressa ostracod
Bromidella rhomboides ostracod
Bellornatia tricollis ostracod | |
Euprimitia sanctipauli ostracod
Primitiella plattevillensis ostracod
Primitiella constricta Ulrich 1894 ostracod | |
Krausella variata Kraft 1962 ostracod | |
Elliptocyprites paracylindrica n. sp. ostracod |