Nachusa Formation Gastropoda and Monoplacophora, Illinois and Iowa: Blackriveran, Illinois, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Tergomya - Tryblidiida - Tryblidiidae
Triblydium excertum (Sardeson 1892)
original and current combination Tryblidium exserta
"Triblydium" excertum
Tergomya - Archinacellida - Archinacellidae
Archinacella deleta (Sardeson 1892)
"Archinacella" deleta
Tergomya - Scenellidae
Scenella spp. n. sp.
"Scenella" n. sp. spp.
Scenella compressa Ulrich and Scofield 1897
"Scenella" compressa
Gastropoda - Bellerophontida - Pterothecidae
Pterotheca attenuata (Hall 1861)
Gastropoda - Bellerophontida - Sinuitidae
Sinuites rectangularis (Ulrich and Scofield 1897)
Gastropoda - Bellerophontida - Temnodiscidae
Tropidodiscus subacutus (Ulrich and Scofield 1897)
recombined as Alaskadiscus subacutus
Gastropoda - Bellerophontida - Bucaniidae
Salpingostoma buelli (Whitfield 1878)
Bucania minnesotensis Ulrich and Scofield 1897
recombined as Loxobucania minnesotensis
Bucania emmonsi Ulrich and Scofield 1897
recombined as Loxobucania emmonsi
Phragmolites fimbriatus (Ulrich and Scofield 1897)
recombined as Phragmolites fimbriata
Phragmolites triangularis (Ulrich and Scofield 1897)
Bucania halli Ulrich and Scofield 1897
Bucania sublata Ulrich and Scofield 1897
Gastropoda - Bellerophontida - Plectonotidae
Tetranota macra Ulrich and Scofield 1897
Tetranota obsoleta Ulrich and Scofield 1897
Tetranota wisconsinensis (Whitfield 1878)
Tetranota sexcarinata Ulrich and Scofield 1897
Gastropoda - Murchisoniina - Hormotomidae
Hormotoma gracilis (Hall 1847)
Hormotoma subangulata Ulrich and Scofield 1897
Gastropoda - Murchisoniina - Lophospiridae
Lophospira helicteres (Salter 1859)
recombined as Eunema helicteres
Lophospira bicincta (Hall 1847)
    = Eunema centralis Ulrich and Scofield 1897
Wagner 2023
Lophospira serratula (Salter 1859)
    = Lophospira serrulata Salter 1859
Wagner 2023
Lophospira conradana Ulrich and Scofield 1897
synonym of Lophospira ventricosa
Lophospira perangulata (Hall 1847)
Lophospira decursa Ulrich and Scofield 1897
Gastropoda - Murchisoniina - Eotomariidae
Clathrospira conica Ulrich and Scofield 1897
Clathrospira subconica (Hall 1847)
Eotomaria supracingulata (Billings 1857)
recombined as Paraliospira supracingulata
Gastropoda - Murchisoniina - Subulitidae
Fusispira spicula Sardeson 1892
Gastropoda - Euomphalina - Macluritidae
Maclurites depressus (Ulrich and Scofield 1897)
Maclurites nitidus (Ulrich and Scofield 1897)
[entered as Maclurites nitidis]
Maclurites bigsbyi (Hall 1861)
recombined as Maclurina bigsbyi
Gastropoda - Euomphalina - Raphistomatidae
Raphistoma sp. Hall 1847
Gastropoda - Euomphalina - Ophiletidae
Ecculiomphalus undulatus Hall 1861
recombined as Lytospira undulatus
Gastropoda - Euomphalina - Lesueurillidae
Ecculiomphalus beloitensis (Ulrich and Scofield 1897)
recombined as Lesueurilla beloitensis
Gastropoda - Euomphalina - Helicotomidae
Ophiletina sublaxa Ulrich and Scofield 1897
Helicotoma planulata Salter 1859
Gastropoda - Euomphalina - Holopeidae
Holopea concinnula Ulrich and Scofield 1897
Holopea ampla Ulrich and Scofield 1897
Holopea insignis Ulrich and Scofield 1897
Holopea rotunda Ulrich and Scofield 1897
Bivalvia - Nuculida - Cardiolariidae
Deceptrix sp. Fuchs 1919
Bivalvia - Solemyida - Ctenodontidae
Ctenodonta sp. Salter 1852
Bivalvia - Colpomyida - Colpomyidae
Eurymya plana
Bivalvia - Myalinida - Ambonychiidae
Ambonychiopsis sp. Isberg 1934
Cleionychia sp. Ulrich 1892
Bivalvia - Cyrtodontida - Cyrtodontidae
Vanuxemia sp. Billings 1858
Cyrtodonta sp. Billings 1858
Cyrtodontula sp. Tomlin 1931
Bivalvia - Modiomorphida - Modiomorphidae
Whiteavesia sp. Ulrich 1893
Endodesma sp. Ulrich 1894
synonym of Cymatonota
Bivalvia - Pholadomyida
Sphenolium sp. Miller 1889
see common names

Geography
Country:United States State/province:Illinois, Iowa
Coordinates: 42.0° North, 90.5° West (view map)
Paleocoordinates:21.3° South, 63.6° West
Basis of coordinate:estimated from map
Geographic resolution:basin
Time
Period:Ordovician Epoch:Late/Upper Ordovician
10 m.y. bin:Ordovician 4-5
*Period:Middle Ordovician - Late/Upper Ordovician *Local age/stage:Blackriveran
Key time interval:Blackriveran
Age range of interval:457.00000 - 449.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Nachusa
Stratigraphic resolution:formation
Lithology and environment
Taphonomy
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection,survey of museum collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: "[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)."
Metadata
Database number:23619
Authorizer:S. Holland, P. Wagner Enterer:T. Hanson, P. Wagner
Modifier:S. Holland Research group:marine invertebrate
Created:2002-07-17 15:53:56 Last modified:2004-10-22 11:29:13
Access level:the public Released:2002-07-17 15:53:56
Creative Commons license:CC BY
Reference information

Primary reference:
6737. 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]

Secondary references:

9042 P. J. Wagner. 2023. Paleozoic Gastropod, Rostroconch, Helcionelloid and Tergomyan Database (2006 - 2023). [P. Wagner/P. Wagner/P. Wagner]