Ion Formation, St. James Member Gastropoda and Monoplacophora, IL and IA: Kirkfieldian, Illinois, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Colpodon sp.
Tergomya - Archinacellida - Archinacellidae
Triblydium (Palacmacea) humilis (Ulrich and Scofield 1897)
recombined as Floripatella humilis
"Triblydium" (Palacmacea) humilis
Archinacella deleta (Sardeson 1892)
"Archinacella" deleta
Tergomya - Cyrtonellida - Cyrtolitidae
Cyrtolites dilatatus (Ulrich and Scofield 1897)
original and current combination Cyrtolites dilatus
Cyrtolites retrorsus Ulrich and Scofield 1897
Tergomya - Tryblidiida - Tryblidiidae
Platyceras depressum Ulrich and Scofield 1897
recombined as Helcionopsis depressum
Gastropoda - Euomphalina - Platyceratidae
Strophostylus textilis (Miller 1897)
corrected as Cyclonema textilis
Cyclonema varicosum (Hall 1861)
Gastropoda - Euomphalina - Raphistomatidae
Raphistoma peracutum Ulrich and Scofield 1897
recombined as Scalites peracutum
Gastropoda - Bellerophontida - Plectonotidae
Tetranota sexcarinata Ulrich and Scofield 1897
Tetranota obsoleta Ulrich and Scofield 1897
Tetranota bidorsata (Hall 1847)
Gastropoda - Bellerophontida - Bucaniidae
Phragmolites obliquus (Ulrich and Scofield 1897)
Bucania emmonsi Ulrich and Scofield 1897
recombined as Loxobucania emmonsi
Salpingostoma buelli (Whitfield 1878)
Gastropoda - Bellerophontida - Pterothecidae
Carinopsis acuta (Ulrich and Scofield 1897)
synonym of Carinaropsis minima
Gastropoda - Bellerophontida - Sinuitidae
Sinuites cancellatus (Hall 1847)
[entered as Sinuites calcellatus]
Sinuites pervolutus (Ulrich and Scofield 1897)
recombined as Sinuites pervoluta
Gastropoda - Murchisoniina - Subulitidae
Fusispira vittata (Hall 1847)
Fusispira spicula Sardeson 1892
Subulites sp. Emmons 1842
Gastropoda - Murchisoniina - Lophospiridae
Lophospira concinnula Ulrich and Scofield 1897
recombined as Eunema concinnula
Lophospira bicincta (Hall 1847)
    = Eunema centralis Ulrich and Scofield 1897
Wagner 2023
Gyronema pulchellum Ulrich and Scofield 1897
Gyronema semicarinatum (Salter 1859)
Lophospira oweni Ulrich and Scofield 1897
recombined as Paupospira oweni
Lophospira peracuta Ulrich and Scofield 1897
synonym of Paupospira burginensis
Lophospira serratula (Salter 1859)
recombined as Lophospira serrulata
Gastropoda - Murchisoniina - Trochonematidae
Trochonema unbilicatum (Hall 1847)
recombined as Trochonema umbilicata
Trochonema retrorsum Ulrich and Scofield 1897
Gastropoda - Murchisoniina - Eotomariidae
Clathrospira conica Ulrich and Scofield 1897
Eunema clivosa (Sardeson 1892)
synonym of Clathrospira conica
Clathrospira subconica (Hall 1847)
Liospira americana (Billings 1860)
Liospira angustata Ulrich and Scofield 1897
Liospira modesta Ulrich and Scofield 1897
Liospira vitruvia (Billings 1865)
Liospira abrupta Ulrich and Scofield 1897
recombined as Paraliospira abrupta
Eotomaria supracingulata (Billings 1857)
recombined as Paraliospira supracingulata
Gastropoda - Murchisoniina - Hormotomidae
Hormotoma gracilis (Hall 1847)
Bivalvia - Nuculanida - Malletiidae
Palaeoneilo sp. Hall and Whitfield 1869
Bivalvia - Solemyida - Ctenodontidae
Ctenodonta sp. Salter 1852
Tancrediopsis sp. (Beushausen 1895)
original and current combination Ctenodonta (Tancrediopsis)
Bivalvia - Nuculida - Praenuculidae
Similodonta sp. Soot-Ryen 1964
Bivalvia - Megalodontida - Plethocardiidae
Plethocardia sp.
Bivalvia - Modiomorphida - Modiomorphidae
Modiolodon sp. Ulrich 1894
Modiolopsis sp. Hall 1847
Aristerella sp. Ulrich 1894
Orthodesma sp. Hall and Whitfield 1875
Bivalvia - Lyrodesmatidae
Lyrodesma sp. Conrad 1841
Bivalvia - Cyrtodontida - Cyrtodontidae
Cyrtodonta sp. Billings 1858
Cyrtodontula sp. Tomlin 1931
Vanuxemia sp. Billings 1858
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:Late/Upper Ordovician *Local age/stage:Kirkfieldian
Key time interval:Kirkfieldian
Age range of interval:457.00000 - 449.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Galena Formation:Ion Member:St. James
Stratigraphic resolution:member
Lithology and environment
Primary lithology: "shale"
Includes fossils?Y
Lithology description: Lithology from F. M. Swain. 1987. Middle and Upper Ordovician Ostracoda of Minnesota and Iowa. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :99-101, R. E. Sloan, ed.
Environment:carbonate indet.
Geology comments: Environmental call by T. Hanson.
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:23644
Authorizer:S. Holland, P. Wagner Enterer:T. Hanson, P. Wagner
Modifier:T. Hanson Research group:marine invertebrate
Created:2002-07-18 08:58:39 Last modified:2002-07-18 12:58:27
Access level:the public Released:2002-07-18 08:58:39
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]