Spechts Ferry Formation Gastropoda and Monoplacophora, Illinois and Iowa: Blackriveran - Rocklandian, Illinois, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Murchisoniina - Trochonematidae
Trochonema retrorsum Ulrich and Scofield 1897
Trochonema unbilicatum (Hall 1847)
recombined as Trochonema umbilicata
Gastropoda - Murchisoniina - Lophospiridae
Gyronema semicarinatum (Salter 1859)
Gyronema pulchellum Ulrich and Scofield 1897
Lophospira concinnula Ulrich and Scofield 1897
recombined as Eunema concinnula
Lophospira bicincta (Hall 1847)
    = Eunema centralis Ulrich and Scofield 1897
Wagner 2023
Lophospira helicteres (Salter 1859)
recombined as Eunema helicteres
Lophospira perangulata (Hall 1847)
Lophospira conradana Ulrich and Scofield 1897
synonym of Lophospira ventricosa
Lophospira decursa Ulrich and Scofield 1897
Lophospira serratula (Salter 1859)
    = Lophospira serrulata Salter 1859
Wagner 2023
Lophospira oweni Ulrich and Scofield 1897
recombined as Paupospira oweni
Lophospira peracuta Ulrich and Scofield 1897
synonym of Paupospira burginensis
Gastropoda - Murchisoniina - Eotomariidae
Clathrospira subconica (Hall 1847)
Clathrospira conica Ulrich and Scofield 1897
Eunema clivosa (Sardeson 1892)
synonym of Clathrospira conica
Liospira angustata Ulrich and Scofield 1897
Liospira vitruvia (Billings 1865)
Liospira americana (Billings 1860)
Liospira modesta Ulrich and Scofield 1897
Eotomaria supracingulata (Billings 1857)
recombined as Paraliospira supracingulata
Liospira abrupta Ulrich and Scofield 1897
recombined as Paraliospira abrupta
Gastropoda - Murchisoniina - Hormotomidae
Hormotoma gracilis (Hall 1847)
Gastropoda - Murchisoniina - Subulitidae
Subulites sp. Emmons 1842
Fusispira vittata (Hall 1847)
Fusispira spicula Sardeson 1892
Gastropoda - Bellerophontida - Temnodiscidae
Tropidodiscus subacutus (Ulrich and Scofield 1897)
recombined as Alaskadiscus subacutus
Gastropoda - Bellerophontida - Sinuitidae
Sinuites rectangularis (Ulrich and Scofield 1897)
Sinuites cancellatus (Hall 1847)
Sinuites pervolutus (Ulrich and Scofield 1897)
recombined as Sinuites pervoluta
Gastropoda - Bellerophontida - Plectonotidae
Tetranota wisconsinensis (Whitfield 1878)
Tetranota obsoleta Ulrich and Scofield 1897
Tetranota macra Ulrich and Scofield 1897
Tetranota sexcarinata Ulrich and Scofield 1897
Gastropoda - Bellerophontida - Bucaniidae
Salpingostoma buelli (Whitfield 1878)
Phragmolites triangularis (Ulrich and Scofield 1897)
Phragmolites obliquus (Ulrich and Scofield 1897)
Phragmolites fimbriatus (Ulrich and Scofield 1897)
recombined as Phragmolites fimbriata
Bucania minnesotensis Ulrich and Scofield 1897
recombined as Loxobucania minnesotensis
Bucania emmonsi Ulrich and Scofield 1897
recombined as Loxobucania emmonsi
Bucania halli Ulrich and Scofield 1897
Gastropoda - Bellerophontida - Pterothecidae
Pterotheca attenuata (Hall 1861)
Carinopsis acuta (Ulrich and Scofield 1897)
synonym of Carinaropsis minima
Gastropoda - Euomphalina - Ophiletidae
Ecculiomphalus undulatus Hall 1861
recombined as Lytospira undulatus
Gastropoda - Euomphalina - Holopeidae
Holopea insignis Ulrich and Scofield 1897
Holopea ampla Ulrich and Scofield 1897
Holopea concinnula Ulrich and Scofield 1897
Holopea rotunda Ulrich and Scofield 1897
Gastropoda - Euomphalina - Helicotomidae
Helicotoma planulata Salter 1859
Ophiletina sublaxa Ulrich and Scofield 1897
Gastropoda - Euomphalina - Lesueurillidae
Ecculiomphalus beloitensis (Ulrich and Scofield 1897)
recombined as Lesueurilla beloitensis
Gastropoda - Euomphalina - Raphistomatidae
Rhaphistoma peracutum (Ulrich and Scofield 1897)
recombined as Scalites peracutum
Gastropoda - Euomphalina - Platyceratidae
Cyclonema varicosum (Hall 1861)
Strophostylus textilis (Miller 1897)
corrected as Cyclonema textilis
Gastropoda - Euomphalina - Macluritidae
Maclurites nitidus (Ulrich and Scofield 1897)
Maclurites depressus (Ulrich and Scofield 1897)
Maclurites bigsbyi (Hall 1861)
recombined as Maclurina bigsbyi
Bivalvia - Lyrodesmatidae
Lyrodesma sp. Conrad 1841
Bivalvia - Modiomorphida - Modiomorphidae
Aristerella sp. Ulrich 1894
Tergomya - Scenellidae
Scenella spp. n. sp.
"Scenella" n. sp. spp.
Scenella compressa Ulrich and Scofield 1897
"Scenella" compressa
Tergomya - Tryblidiida - Tryblidiidae
Triblydium excertum (Sardeson 1892)
original and current combination Tryblidium exserta
"Triblydium" excertum
Platyceras depressum Ulrich and Scofield 1897
recombined as Helcionopsis depressum
Tergomya - Archinacellida - Archinacellidae
Archinacella deleta (Sardeson 1892)
"Archinacella" deleta
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 - Rocklandian
Key time interval:Blackriveran - Rocklandian
Age range of interval:457.00000 - 449.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Spechts Ferry
Stratigraphic resolution:formation
Lithology and environment
Primary lithology:pyritic,green "shale"
Includes fossils?Y
Lithology description: "[D]ark-green to green-gray, thin-bedded, soft, locally pyritic shale interbedded with fine- to medium-grained argillaceous limestone." Lithology from O. L. Karklins. 1987. Bryozoa from Rocklandian (Middle Ordovician) rocks of the Upper Mississippi Valley region. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :173-176. 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:23621
Authorizer:S. Holland, P. Wagner Enterer:T. Hanson, P. Wagner
Modifier:T. Hanson Research group:marine invertebrate
Created:2002-07-17 16:45:37 Last modified:2003-07-18 18:05:03
Access level:the public Released:2002-07-17 16:45:37
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]