Sardeson Collection, Dunleith Formation, Beecher Member, Illinois and Iowa (Ordovician of the United States)

Where: Illinois, Iowa (42.0° N, 90.5° W: paleocoordinates 21.3° S, 63.6° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Belodina confluens conodont zone, Beecher Member (Dunleith Formation), Shermanian (457.3 - 449.6 Ma)

• member-level stratigraphic resolution

Environment/lithology: limestone

• Environmental call by T. Hanson.
• 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: macrofossils

Primary reference: W. F. Rice and E. P. Hedblom. 1987. Brachiopods and trilobites of the Sardeson Beds in the Twin Cities. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 131-135 [S. Holland/T. Hanson/T. Hanson]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23799: authorized by Steven Holland, entered by Tori Hanson on 21.07.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Trilobita
 Corynexochida - Illaenidae
Illaenus sp., Bumastoides porrectus
Illaenus sp. Dalman 1827 trilobite
 Asaphida - Asaphidae
Isotelus gigas
Isotelus gigas Dekay 1824 trilobite
 Phacopida - Calymenidae
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria Conrad 1841 trilobite
 Phacopida - Pterygometopidae
Eomonorachus intermedius, Sceptaspis lincolnensis
Eomonorachus intermedius Walcott 1879 trilobite
Sceptaspis lincolnensis Branson 1909 trilobite
 Phacopida - Encrinuridae
"Encrinuroides vigilans" = Erratencrinurus vigilans
"Encrinuroides vigilans" = Erratencrinurus vigilans Hall 1847 trilobite
 Phacopida - Cheiruridae
Ceraurus pleurexanthemus
Ceraurus pleurexanthemus Green 1832 trilobite
Craniata
 Craniopsida - Craniopsidae
Craniops minor
 Craniida - Craniidae
Acanthocrania granulosa, Petrocrania trentonensis
Strophomenata
 Strophomenida - Strophomenidae
Strophomena billingsi
Strophomena billingsi Winchell and Schuchert 1893
 Strophomenida - Glyptomenidae
"Holtedahlina emaciata" = Pionomena emaciata
"Holtedahlina emaciata" = Pionomena emaciata Winchell and Schuchert 1892
 Strophomenida - Furcitellidae
Furcitella scofieldi, Oepikina minnesotensis
Furcitella scofieldi Winchell and Schuchert 1892
Oepikina minnesotensis Winchell 1881
 Strophomenida - Rafinesquinidae
Rafinesquina trentonensis
 Strophomenida - Sowerbyellidae
Sowerbyella curdsvillensis
 Billingsellida - Clitambonitidae
Vellamo americana
Rhynchonellata
 Pentamerida - Parastrophinidae
Parastrophina bernensis
 Orthida - Draboviidae
Pionodema circularis, Pionodema subaequata, ? Diorthelasma weissi
Pionodema subaequata Conrad 1843
 Orthida - Dalmanellidae
Paucicrura rogata
Paucicrura rogata Sardeson 1892
 Orthida - Glyptorthidae
Glyptorthis bellarugosa
 Orthida - Plaesiomyidae
"Plaesiomys meedsi" = Dinorthis meedsi, Dinorthis pectinella
"Plaesiomys meedsi" = Dinorthis meedsi Winchell and Schuchert 1892
Dinorthis pectinella Emmons 1842
 Orthida - Hesperorthidae
Hesperorthis tricenaria
 Orthida - Platystrophiidae
Platystrophia amoena, Platystrophia trentonensis
 Orthida - Plectorthidae
Plectorthis plicatella
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema wisconsinense, Rhynchotrema laticosta
 Atrypida - Anazygidae
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
Lingulata
 Lingulida - Pseudolingulidae
? Pseudolingula iowensis
 Lingulida - Obolidae
Pachyglossella elderi, Pachyglossella riciniformis
 Lingulida - Trematidae
Schizocrania filosa