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: Prosser Limestone Formation, Shermanian (457.3 - 449.6 Ma)
• Beds numbered by F. W. Sardeson.
• group of beds-level stratigraphic resolution
Environment/lithology:
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 23278: authorized by Steven Holland, entered by Tori Hanson on 11.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
Trilobita | |
"Encrinuroides vigilans" = Erratencrinurus vigilans
"Encrinuroides vigilans" = Erratencrinurus vigilans Hall 1847 trilobite | |
Ceraurus pleurexanthemus Green 1832 trilobite | |
Sceptaspis lincolnensis Branson 1909 trilobite | |
Isotelus gigas Dekay 1824 trilobite | |
Bumastus orbicaudatus Billings 1859 trilobite
Illaenus sp. Dalman 1827 trilobite | |
Rhynchonellata | |
Skenidioides anthonense Sardeson 1894 | |
Dinorthis pectinella, "Plaesiomys meedsi" = Dinorthis meedsi
Dinorthis pectinella Emmons 1842
"Plaesiomys meedsi" = Dinorthis meedsi Winchell and Schuchert 1892 | |
Glyptorthis bellarugosa Conrad 1843 | |
Hesperorthis tricenaria Conrad 1843 | |
Platystrophia trentonensis McEwan 1919
Platystrophia amoena McEwan 1919 | |
Plectorthis plicatella Hall 1847 | |
"Zygospira recurvirostris" = Anazyga recurvirostra
"Zygospira recurvirostris" = Anazyga recurvirostra Hall 1847 | |
Strophomenata | |
Furcitella scofieldi Winchell and Schuchert 1892
Oepikina minnesotensis Winchell 1881 | |
Rafinesquina trentonensis Hall 1847 | |
Strophomena billingsi Winchell and Schuchert 1893
Strophomena septata Winchell and Schuchert 1892 | |
Sowerbyella curdsvillensis Foerste 1912
Sowerbyella minnesotensis Sardeson 1892 | |
Craniata | |
Acanthocrania granulosa, "Acanthocrania setigeria" = Acanthocrania setigera, Petrocrania trentonensis
| |
Lingulata | |
? Pseudolingula iowensis Owen 1844 | |