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: Amorphognathus superbus conodont zone, Stewartville Member (Wise Lake Formation), Edenian (451.0 - 450.2 Ma)
• Given as Stewartville Formation
• bed-level stratigraphic resolution
Environment/lithology: gray wackestone
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 23280: authorized by Steven Holland, entered by Tori Hanson on 11.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Rhynchonellata | |
Cyclospira bisulcata Emmons 1842 | |
"Lepidocyclus capax" = Hiscobeccus capax
"Lepidocyclus capax" = Hiscobeccus capax Conrad 1842 | |
"Parastrophia bernensis" = Parastrophina
| |
Paucicrura rogata Sardeson 1892 | |
"Plaesiomys meedsi" = Dinorthis meedsi
"Plaesiomys meedsi" = Dinorthis meedsi Winchell and Schuchert 1892 | |
Hesperorthis tricenaria Conrad 1843 | |
Glyptorthis bellarugosa Conrad 1843 | |
Strophomenata | |
Sowerbyella minnesotensis Sardeson 1892 | |
"Strophomena trilobita" = Strophomena trilobata
"Strophomena trilobita" = Strophomena trilobata Owen 1852 | |
Rafinesquina deltoidea Conrad 1838 | |
Lingulata | |
? Pseudolingula iowensis Owen 1844 | |
Trilobita | |
Isotelus susae Whitfield 1882 trilobite
Isotelus gigas Dekay 1824 trilobite | |
Sceptaspis lincolnensis Branson 1909 trilobite | |
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria
"Flexicalymene senaria" = Flexicalymene (Flexicalymene) senaria Conrad 1841 trilobite | |
"Encrinuroides vigilans" = Erratencrinurus vigilans
"Encrinuroides vigilans" = Erratencrinurus vigilans Hall 1847 trilobite | |
Ceraurinus icarus Billings 1860 trilobite
Ceraurus pleurexanthemus Green 1832 trilobite | |
Bumastus orbicaudatus Billings 1859 trilobite |