Sardeson Collection, Decorah Shale (Ordovician to of the United States)

Where: Minnesota (45.0° N, 93.3° W: paleocoordinates 17.8° S, 62.8° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Decorah Shale Formation (Galena Group), Rocklandian to Rocklandian (457.3 - 449.6 Ma)

• Beds numbered by F. W. Sardeson.

• group of beds-level stratigraphic resolution

Environment/lithology: calcareous shale

• Environmental call by T. Hanson
• Shale and calcareous shale.

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 23277: 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
unclassified
  -
Rosticellula colei
Lingulata
 Lingulida - Obolidae
Pachyglossella elderi
 Lingulida - Pseudolingulidae
? Pseudolingula iowensis
 Lingulida - Trematidae
Schizocrania filosa, Trematis huronensis
Trematis huronensis Billings 1865
Craniata
 Craniida - Craniidae
"Acanthocrania setigeria" = Acanthocrania setigera, Petrocrania trentonensis, Petrocrania halli
"Acanthocrania setigeria" = Acanthocrania setigera Hall 1866
[entered as Acanthocrania setigera]
Strophomenata
 Strophomenida - Sowerbyellidae
Sowerbyella curdsvillensis
 Strophomenida - Strophomenidae
"Bellimurina charlottae" = Bellimurina (Bellimurina) charlottae, Strophomena septata, Strophomena filitexta
"Bellimurina charlottae" = Bellimurina (Bellimurina) charlottae Winchell and Schuchert 1892
Strophomena septata Winchell and Schuchert 1892
 Strophomenida - Furcitellidae
Oepikina inquassa, Oepikina minnesotensis
Oepikina minnesotensis Winchell 1881
 Strophomenida - Rafinesquinidae
Rafinesquina trentonensis
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
Rostricellula minnesotensis
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema ainsliei, Rhynchotrema wisconsinense
 Protorthida - Skenidiidae
Skenidioides anthonense
 Orthida - Dalmanellidae
Paucicrura rogata, Dalmanella cf. rara, Dalmanella ? sculpta
Paucicrura rogata Sardeson 1892
Dalmanella ? sculpta Cooper 1956
 Orthida - Draboviidae
Pionodema circularis, Pionodema subaequata, ? Diorthelasma weissi
Pionodema subaequata Conrad 1843
 Orthida - Glyptorthidae
Glyptorthis bellarugosa
 Orthida - Hesperorthidae
Hesperorthis tricenaria
 Orthida - Plaesiomyidae
"Plaesiomys meedsi" = Dinorthis meedsi
"Plaesiomys meedsi" = Dinorthis meedsi Winchell and Schuchert 1892
 Orthida - Platystrophiidae
Platystrophia trentonensis, Platystrophia amoena
Platystrophia amoena McEwan 1919
 Orthida - Plectorthidae
Doleroides pervetus
 Atrypida - Anazygidae
Zygospira lebanonensis, "Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847
 Atrypida - Protozygidae
"Protozyga nicolleti" = Manespira nicolleti
"Protozyga nicolleti" = Manespira nicolleti Winchell and Schuchert 1892
 Atrypida - Septatrypidae
Idiospira panderi
 Pentamerida - Parastrophinidae
Parastrophina rotundiformis
Trilobita
 Phacopida - Cheiruridae
"Acanthoparypha evetti" = Acanthoparypha evitti
"Acanthoparypha evetti" = Acanthoparypha evitti Chatterton and Ludvigsen 1976 trilobite
 Phacopida - Pterygometopidae
Sceptaspis lincolnensis, Eomonorachus intermedius
Sceptaspis lincolnensis Branson 1909 trilobite
Eomonorachus intermedius Walcott 1879 trilobite
 Corynexochida - Illaenidae
Thaleops sp., Bumastoides sp., Bumastoides porrectus
Thaleops sp. Conrad 1843 trilobite
Bumastoides sp. Whittington 1954 trilobite
 Asaphida - Asaphidae
Isotelus gigas
Isotelus gigas Dekay 1824 trilobite