Grand Detour Formation, Iowa and Wisconsin (Ordovician of the United States)

Where: Iowa/Wisconsin (42.0° N, 90.0° W: paleocoordinates 21.6° S, 63.4° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Grand Detour Formation (Platteville Group), Blackriveran (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: limestone

• Lithology and environment taken from Kolata, D. R. "Lithostratigraphy of the Plateville, Galena and Maquoketa Groups in Northern Illinois." Middle and Late Ordovician Lithostratigraphy and Biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35, p. 21-24. R. E. Sloan, ed.

Size class: macrofossils

Primary reference: L. L. DeMott. 1987. Platteville and Decorah Trilobites from Illinois and Wisconsin. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 [S. Holland/T. Hanson/S. Holland]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23119: 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
Trilobita
 Asaphida - Asaphidae
"Basiliella barrandi" = Basilicus (Basiliella), Isotelus simplex
"Basiliella barrandi" = Basilicus (Basiliella) trilobite
Isotelus simplex Raymond and Narraway 1910 trilobite
 Corynexochida - Illaenidae
Thaleops sp., Thaleops ovata, Bumastoides milleri, Illaenus spp.
Thaleops sp. Conrad 1843 trilobite
Thaleops ovata Conrad 1843 trilobite
Bumastoides milleri Billings 1859 trilobite
Illaenus spp. Dalman 1827 trilobite
 Proetida - Bathyuridae
"Raymondites longispinus" = Bathyurus (Raymondites) longispinus
"Raymondites longispinus" = Bathyurus (Raymondites) longispinus Walcott 1876 trilobite
 Lichida - Lichidae
Amphilichas sp.
Amphilichas sp. Raymond 1905 trilobite
 Harpetida - Harpetidae
"Dolichoharpes aff. reticulatus" = Dolichoharpes reticulata
"Dolichoharpes aff. reticulatus" = Dolichoharpes reticulata Whittington 1949 trilobite
 Phacopida - Cheiruridae
Ceraurinella sp., Ceraurinella templetoni, Gabriceraurus mifflinensis
Ceraurinella sp. Cooper 1953 trilobite
 Phacopida - Encrinuridae
"Encrinuroides rarus" = Walencrinuroides rarus
"Encrinuroides rarus" = Walencrinuroides rarus Walcott 1877 trilobite
 Phacopida - Pliomeridae
Anapliomera shirlandensis
 Phacopida - Pterygometopidae
Sceptaspis lincolnensis, Calyptaulax plattevillensis
Sceptaspis lincolnensis Branson 1909 trilobite