Platteville & Decorah Formation Conodonts of St. Paul (Ordovician to of the United States)

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

When: Platteville, Decorah Formation, Blackriveran to Blackriveran (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: limestone and shale

• Environmental call by T. Hanson.
• Lithology from F. M. Swain. 1987. Middle and Upper Ordovician Ostracoda of Minnesota and Iowa. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :99-101.

Size class: microfossils

Collection methods: chemical,

Primary reference: W. C. Sweet. 1987. Distribution and significance of conodonts in Middle and Upper Ordovician strata of the Upper Mississippi Valley region. In R. E. Sloan (ed.), Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 167-172 [S. Holland/T. Hanson/S. Bruning]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23295: authorized by Steven Holland, entered by Tori Hanson on 11.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Conodonta
 Prioniodontida -
Oulodus serratus, Erismodus quadridactylus
Erismodus quadridactylus Stauffer 1935 conodont
 Prioniodontida - Chirognathidae
Curtognathus spp.
Curtognathus spp. Branson and Mehl 1933 conodont
 Prioniodontida - Plectodinidae
Scyphiodus primus
 Prioniodontida - Cyrtoniodontidae
? Bryantodina abrupta, Bryantodina typicalis
 Prioniodontida - Polyplacognathidae
Polyplacognathus ramosus
 Prioniodontida - Balognathidae
Tetraprioniodus breviconus
Tetraprioniodus breviconus conodont
"Tetraprioniodus" breviconus
 Prioniodontida -
Phragmodus cognitus, Phragmodus undatus
 Panderodontida - Panderodontidae
Panderodus feulneri, Panderodus panderi, Panderodus gracilis, Belodina compressa
Panderodus feulneri Glenister 1957 conodont
Panderodus panderi Stauffer 1940 conodont
Panderodus gracilis Branson and Mehl 1933 conodont
Belodina compressa Branson and Mehl 1933 conodont
 Ozarkodinida -
Plectodina aculeata, Plectodina tenuis, Periodon grandis
Periodon grandis Ethington 1959 conodont
 Protopanderodontida - Drepanoistodontidae
Drepanoistodus suberectus
Drepanoistodus suberectus Branson and Mehl 1933 conodont
 Protopanderodontida - Protopanderodontidae
Staufferella falcata