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: Nachusa Formation, Blackriveran (457.3 - 449.6 Ma)
• formation-level stratigraphic resolution
Environment/lithology:
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on a review of the Sardeson Collection at the University of Minnesota, Weiss (1953), Ulrich and Scofield (1895), the unpublished work of Levorson and Gerk, and the list in Stauffer and Thiel (1941)."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 23619: authorized by Steven Holland, entered by Tori Hanson on 17.07.2002, edited by Pete Wagner
Creative Commons license: CC BY (attribution)
Taxonomic list
Tergomya | |
Scenella spp. n. sp., Scenella compressa
| |
"Triblydium excertum" = Tryblidium exserta
| |
| |
Bivalvia | |
Deceptrix sp. Fuchs 1919 clam | |
Ctenodonta sp. Salter 1852 clam | |
"Endodesma sp." = Cymatonota, Whiteavesia sp.
"Endodesma sp." = Cymatonota Ulrich 1893 clam
Whiteavesia sp. Ulrich 1893 clam | |
Sphenolium sp. Miller 1889 clam | |
Eurymya plana clam | |
Ambonychiopsis sp. Isberg 1934 clam
Cleionychia sp. Ulrich 1892 clam | |
Cyrtodontula sp. Tomlin 1931 clam
Vanuxemia sp. Billings 1858 clam
Cyrtodonta sp. Billings 1858 clam | |
Gastropoda | |
Tetranota sexcarinata Ulrich and Scofield 1897 snail
Tetranota wisconsinensis Whitfield 1878 snail
Tetranota obsoleta Ulrich and Scofield 1897 snail
Tetranota macra Ulrich and Scofield 1897 snail | |
"Bucania minnesotensis" = Loxobucania minnesotensis, "Bucania emmonsi" = Loxobucania emmonsi, Bucania halli, Bucania sublata, Phragmolites triangularis, "Phragmolites fimbriatus" = Phragmolites fimbriata, Salpingostoma buelli
"Bucania minnesotensis" = Loxobucania minnesotensis Ulrich and Scofield 1897 snail
"Bucania emmonsi" = Loxobucania emmonsi Ulrich and Scofield 1897 snail
Bucania halli Ulrich and Scofield 1897 snail
Bucania sublata Ulrich and Scofield 1897 snail
Phragmolites triangularis Ulrich and Scofield 1897 snail
"Phragmolites fimbriatus" = Phragmolites fimbriata Ulrich and Scofield 1897 snail
Salpingostoma buelli Whitfield 1878 snail | |
Pterotheca attenuata Hall 1861 snail | |
"Tropidodiscus subacutus" = Alaskadiscus subacutus
"Tropidodiscus subacutus" = Alaskadiscus subacutus Ulrich and Scofield 1897 snail | |
Sinuites rectangularis Ulrich and Scofield 1897 snail | |
Holopea rotunda Ulrich and Scofield 1897 snail
Holopea concinnula Ulrich and Scofield 1897 snail
Holopea ampla Ulrich and Scofield 1897 snail
Holopea insignis Ulrich and Scofield 1897 snail | |
Helicotoma planulata Salter 1859 snail
Ophiletina sublaxa Ulrich and Scofield 1897 snail | |
"Ecculiomphalus beloitensis" = Lesueurilla beloitensis
"Ecculiomphalus beloitensis" = Lesueurilla beloitensis Ulrich and Scofield 1897 snail | |
Raphistoma sp. Hall 1847 snail | |
Maclurites depressus Ulrich and Scofield 1897 snail
"Maclurites bigsbyi" = Maclurina bigsbyi Hall 1861 snail | |
"Ecculiomphalus undulatus" = Lytospira undulatus
"Ecculiomphalus undulatus" = Lytospira undulatus Hall 1861 snail | |
Hormotoma gracilis Hall 1847 snail
Hormotoma subangulata Ulrich and Scofield 1897 snail | |
Eunema centralis, "Lophospira helicteres" = Eunema helicteres, "Lophospira conradana" = Lophospira ventricosa, Lophospira decursa, Lophospira serrulata, Lophospira perangulata
Eunema centralis Ulrich and Scofield 1897 snail
"Lophospira helicteres" = Eunema helicteres Salter 1859 snail
"Lophospira conradana" = Lophospira ventricosa Hall 1847 snail
Lophospira decursa Ulrich and Scofield 1897 snail
Lophospira serrulata Salter 1859 snail
Lophospira perangulata Hall 1847 snail | |
Fusispira spicula Sardeson 1892 snail | |
"Eotomaria supracingulata" = Paraliospira supracingulata, Clathrospira subconica, Clathrospira conica
"Eotomaria supracingulata" = Paraliospira supracingulata Billings 1857 snail
Clathrospira subconica Hall 1847 snail
Clathrospira conica Ulrich and Scofield 1897 snail |