PBDB Collection

Ion Formation, St. James Member Gastropoda and Monoplacophora, IL and IA (Ordovician of the United States)

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. James Member (Ion Formation), Kirkfieldian (457.3 - 449.6 Ma)

• member-level stratigraphic resolution

Environment/lithology: shale

• Environmental call by T. Hanson.

• 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.

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on a review of the Sardeson Collection at the University of Minnesota, Weiss (1953), Ulrich and Scofield (1895), the unpublished work of Levorson and Gerk, and the list in Stauffer and Thiel (1941)."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 23644: authorized by Steven Holland, entered by Tori Hanson on 18.07.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Mammalia
Notoungulata - Leontiniidae	Colpodon sp. Colpodon sp. notoungulate
Tergomya
Archinacellida - Archinacellidae	"Triblydium (Palacmacea) humilis" = Floripatella humilis, Archinacella deleta "Triblydium (Palacmacea) humilis" = Floripatella humilis Ulrich and Scofield 1897 "Triblydium" (Palacmacea) humilis Archinacella deleta Sardeson 1892 "Archinacella" deleta
Cyrtonellida - Cyrtolitidae	Cyrtolites retrorsus, "Cyrtolites dilatatus" = Cyrtolites dilatus Cyrtolites retrorsus Ulrich and Scofield 1897 "Cyrtolites dilatatus" = Cyrtolites dilatus Ulrich and Scofield 1897
Tryblidiida - Tryblidiidae	"Platyceras depressum" = Helcionopsis depressum "Platyceras depressum" = Helcionopsis depressum Ulrich and Scofield 1897
Bivalvia
Solemyida - Ctenodontidae	Tancrediopsis sp., Ctenodonta sp. Tancrediopsis sp. Beushausen 1895 clam Ctenodonta sp. Salter 1852 clam
Nuculida - Praenuculidae	Similodonta sp. Similodonta sp. Soot-Ryen 1964 clam
Nuculanida - Malletiidae	Palaeoneilo sp. Palaeoneilo sp. Hall and Whitfield 1869 clam
Cyrtodontida - Cyrtodontidae	Vanuxemia sp., Cyrtodonta sp., Cyrtodontula sp. Vanuxemia sp. Billings 1858 clam Cyrtodonta sp. Billings 1858 clam Cyrtodontula sp. Tomlin 1931 clam
Megalodontida - Plethocardiidae	Plethocardia sp. Plethocardia sp. clam
Modiomorphida - Modiomorphidae	Aristerella sp., Orthodesma sp., Modiolopsis sp., Modiolodon sp. Aristerella sp. Ulrich 1894 clam Orthodesma sp. Hall and Whitfield 1875 clam Modiolopsis sp. Hall 1847 clam Modiolodon sp. Ulrich 1894 clam
Unioni - Lyrodesmatidae	Lyrodesma sp. Lyrodesma sp. Conrad 1841 clam
Gastropoda
Murchisoniina - Hormotomidae	Hormotoma gracilis Hormotoma gracilis Hall 1847 snail
Murchisoniina - Trochonematidae	"Trochonema unbilicatum" = Trochonema umbilicata, Trochonema retrorsum "Trochonema unbilicatum" = Trochonema umbilicata Hall 1847 snail Trochonema retrorsum Ulrich and Scofield 1897 snail
Murchisoniina - Lophospiridae	Gyronema semicarinatum, Gyronema pulchellum, Eunema centralis, "Lophospira concinnula" = Eunema concinnula, "Lophospira peracuta" = Paupospira burginensis, "Lophospira oweni" = Paupospira oweni, "Lophospira serratula" = Lophospira serrulata Gyronema semicarinatum Salter 1859 snail Gyronema pulchellum Ulrich and Scofield 1897 snail Eunema centralis Ulrich and Scofield 1897 snail "Lophospira concinnula" = Eunema concinnula Ulrich and Scofield 1897 snail "Lophospira peracuta" = Paupospira burginensis Ulrich and Scofield 1897 snail "Lophospira oweni" = Paupospira oweni Ulrich and Scofield 1897 snail "Lophospira serratula" = Lophospira serrulata Salter 1859 snail
Murchisoniina - Eotomariidae	"Eotomaria supracingulata" = Paraliospira supracingulata, "Liospira abrupta" = Paraliospira abrupta, Liospira vitruvia, Liospira angustata, Liospira americana, Liospira modesta, Clathrospira subconica, "Clathrospira conica" = Clathrospira conica, "Eunema clivosa" = Clathrospira conica "Eotomaria supracingulata" = Paraliospira supracingulata Billings 1857 snail "Liospira abrupta" = Paraliospira abrupta Ulrich and Scofield 1897 snail Liospira vitruvia Billings 1865 snail Liospira angustata Ulrich and Scofield 1897 snail Liospira americana Billings 1860 snail Liospira modesta Ulrich and Scofield 1897 snail Clathrospira subconica Hall 1847 snail "Clathrospira conica" = Clathrospira conica Ulrich and Scofield 1897 snail "Eunema clivosa" = Clathrospira conica Ulrich and Scofield 1897 snail
Murchisoniina - Subulitidae	Subulites sp., Fusispira vittata, Fusispira spicula Subulites sp. Emmons 1842 snail Fusispira vittata Hall 1847 snail Fusispira spicula Sardeson 1892 snail
Bellerophontida - Pterothecidae	"Carinopsis acuta" = Carinaropsis minima "Carinopsis acuta" = Carinaropsis minima Ulrich and Scofield 1897 snail
Bellerophontida - Plectonotidae	Tetranota bidorsata, Tetranota obsoleta, Tetranota sexcarinata Tetranota bidorsata Hall 1847 snail Tetranota obsoleta Ulrich and Scofield 1897 snail Tetranota sexcarinata Ulrich and Scofield 1897 snail
Bellerophontida - Bucaniidae	Phragmolites obliquus, "Bucania emmonsi" = Loxobucania emmonsi, Salpingostoma buelli Phragmolites obliquus Ulrich and Scofield 1897 snail "Bucania emmonsi" = Loxobucania emmonsi Ulrich and Scofield 1897 snail Salpingostoma buelli Whitfield 1878 snail
Bellerophontida - Sinuitidae	"Sinuites pervolutus" = Sinuites pervoluta, Sinuites cancellatus "Sinuites pervolutus" = Sinuites pervoluta Ulrich and Scofield 1897 snail Sinuites cancellatus Hall 1847 snail [entered as Sinuites calcellatus]
Euomphalina - Raphistomatidae	"Raphistoma peracutum" = Scalites peracutum "Raphistoma peracutum" = Scalites peracutum Ulrich and Scofield 1897 snail
Euomphalina - Platyceratidae	Cyclonema varicosum, "Strophostylus textilis" = Cyclonema textilis Cyclonema varicosum Hall 1861 snail "Strophostylus textilis" = Cyclonema textilis Miller 1897 snail