PBDB Collection

Upper Decorah Shale Ostracodes in Minnesota (Ordovician to 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: Strictopora minima zone, Decorah Shale Formation, Rocklandian to Rocklandian (457.3 - 449.6 Ma)

• Correlates with the Ion Member of northeastern Iowa

• formation-level stratigraphic resolution

Environment/lithology: gray shale and limestone

• Environmental call by T. Hanson.

• "A few feet to 20 feet or more of greenishm-gray shale and blocky to thin-bedded fossiliferous limestone. The so-called fucoidal beds that contain many vermicular burrows and the goethitic "brassy oolites" beds are somewhat more common in the upper than the middle Decorah but that unit also contains these deposits locally."

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 23148: authorized by Steven Holland, entered by Tori Hanson on 10.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Ostracoda
Podocopida - Bairdiocyprididae	Elliptocyprites paracylindrica n. sp. Elliptocyprites paracylindrica n. sp. ostracod
Podocopida - Bairdiidae	Krausella arcuata Krausella arcuata ostracod
Palaeocopida - Primitiidae	Primitia mammata Primitia mammata ostracod
Palaeocopida - Aechminidae	Pseudulrichia simplex Pseudulrichia simplex ostracod
Palaeocopida - Bolliidae	Dicranella bicornis, Dicranella marginata, Quasibollia persulcata, Bollia subaequata, Maratia mara, Maratia micula Dicranella bicornis ostracod Dicranella marginata ostracod Quasibollia persulcata Ulrich 1879 ostracod Bollia subaequata ostracod Maratia mara ostracod Maratia micula ostracod
Palaeocopida - Drepanellidae	Scofieldia bilateralis Scofieldia bilateralis ostracod
Palaeocopida - Eurychilinidae	Eurychilina ventrosa, Eurychilina reticulata, Eurychilina micropunctata n. sp., Eurychilina sugarcreekensis n. sp., Eurychilina cannonfallsensis n. sp., Eurychilina kayi n. sp., Eurychilina partifimbriata, Eurychilina minutifoveata Eurychilina ventrosa ostracod Eurychilina reticulata ostracod Eurychilina micropunctata n. sp. ostracod Eurychilina sugarcreekensis n. sp. ostracod Eurychilina cannonfallsensis n. sp. ostracod Eurychilina kayi n. sp. ostracod Eurychilina partifimbriata ostracod Eurychilina minutifoveata ostracod
Palaeocopida - Hollinidae	Winchellatia lansingensis, Winchellatia minnesotensis, ? Winchellatia ceratopea n. sp. Winchellatia lansingensis ostracod Winchellatia minnesotensis ostracod ? Winchellatia ceratopea n. sp. ostracod
Palaeocopida - Oepikellidae	Opikatia emaciata, Opikatia rotunda Opikatia emaciata ostracod Opikatia rotunda ostracod
Palaeocopida - Tetradellidae	Raymondatia goniglypta, Bellornatia tricollis, Thomasatia falcicosta, Bromidella depressa, ? Kiesowia verrucosa, Tetradella ellipsilira, Tetradella ulrichi, Dilobella typa, Dilobella simplex, Ceratopsis quadrifida, Ceratopsis chambersi Raymondatia goniglypta ostracod Bellornatia tricollis ostracod Thomasatia falcicosta ostracod Bromidella depressa ostracod ? Kiesowia verrucosa ostracod Tetradella ellipsilira ostracod Tetradella ulrichi ostracod Dilobella typa ostracod Dilobella simplex ostracod Ceratopsis quadrifida ostracod Ceratopsis chambersi Miller 1874 ostracod
Palaeocopida - Euprimitiidae	Hallatia particylindrica, Euprimitia labiosa, Primitiella plattevillensis, Primitiella constricta Hallatia particylindrica ostracod Euprimitia labiosa ostracod Primitiella plattevillensis ostracod Primitiella constricta Ulrich 1894 ostracod