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: St. Peter Sandstone Formation, Blackriveran (457.3 - 449.6 Ma)
• formation-level stratigraphic resolution
Environment/lithology: marine; sandstone
Size class: macrofossils
Collection methods: "[B]ased on a review of the Sardeson Collection at the University of Minnesota, Weiss (1953), Ulrich and Scofield (1895), the unpublished work of Levorson and Gerk, and the list in Stauffer and Thiel (1941)."
Primary reference: R. E. Sloan and G. F. Webers. 1987. Stratigraphic ranges of Middle and Late Ordovician Gastropoda and Monoplacophora of Minnesota. In R. E. Sloan (ed.), Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 183-186 [S. Holland/T. Hanson/S. Bruning]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 23612: authorized by Steven Holland, entered by Tori Hanson on 17.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
"Lophospira tricarinata" = Lophospira perangulata
"Lophospira tricarinata" = Lophospira perangulata Hall 1847 snail | |
Omospira laticincta Ulrich and Scofield 1897 snail | |
Hormotoma gracilis Hall 1847 snail | |
Holopea obliqua Hall 1847 snail | |
"Ophileta fausta" = Ophiletina fausta
"Ophileta fausta" = Ophiletina fausta Sardeson 1896 snail | |
"Horiostomella aiens" = Cyclonema aiens
"Horiostomella aiens" = Cyclonema aiens Sardeson 1896 snail | |
Bivalvia | |
Deceptrix sp. Fuchs 1919 clam | |
Goniophora sp. Phillips 1848 clam
"Psiloconcha sp." = Cymatonota Ulrich 1893 clam
Orthodesma sp. Hall and Whitfield 1875 clam
Modiolopsis sp. Hall 1847 clam | |
Cyrtodonta sp. Billings 1858 clam | |
Ambonychiopsis sp. Isberg 1934 clam | |
Tergomya | |
Cyrtonellopsis vetulum Sardeson 1896 |