Dunleith Formation, Mortimer Member Ostracodes of Iowa (Ordovician of the United States)

Where: Iowa (42.0° N, 94.0° W: paleocoordinates 19.4° S, 65.5° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Mortimer Member (Dunleith Formation), Shermanian (457.3 - 449.6 Ma)

• member-level stratigraphic resolution

Environment/lithology: limestone

• Environmental call by T. Hanson.
• Limestone, sometimes dolomitic. Lithology from C. O. Leverson, A. J. Gerk, R. E. Sloan, & L. A. Bisagno. General section of the Middle and Late Ordovician strata of Northeastern Iowa, Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35, p.25-39. Edited by R. E. Sloan.

Size class: microfossils

Collection methods: chemical,

Primary reference: F. M. Swain. 1987. Middle and Upper Ordovician Ostracoda of Minnesota and Iowa. In R. E. Sloan (ed.), Minnesota Geological Survey Report of Investigations 35:99-101 [S. Holland/T. Hanson/S. Bruning]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23231: 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
 Palaeocopida - Cryptophyllidae
Cryptophyllus oboloides
 Palaeocopida - Eurychilinidae
Nodambichilina symmetrica
Nodambichilina symmetrica Ulrich 1894 ostracod
 Palaeocopida - Aparchitidae
Macronotella arcta, Macronotella scofieldi
Macronotella scofieldi Ulrich 1894 ostracod
 Palaeocopida - Circulinidae
Pedomphalella subovata
 Palaeocopida - Aechminidae
Byrsolopsina ovata