Scales Shale, Clermont Member Gastropoda and Monoplacophora, Illinois and Iowa (Ordovician of the United States)

Where: Illinois, Iowa (42.0° N, 90.5° W)

• Paleocoordinates: 16.6° S, 116.8° W (Wright 2013)

• coordinate estimated from map

• basin-level geographic resolution

When: Clermont Member (Scales Shale Formation), Maysvillian (450.2 - 449.6 Ma)

• member-level stratigraphic resolution

Environment/lithology: green shale

• Environmental call by T. Hanson.
• Shale, bluish-green. Lithology from Lithology from C. O. Leverson, A. J. Gerk, R. E. Sloan, & L. A. Bisagno. General section of the Middle and Late Ordovician strata of Northeastern Iowa, Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35, p.25-39. Edited by R. E. Sloan.

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on a review of the Sardeson Collection at the University of Minnesota, Weiss (1953), Ulrich and Scofield (1895), the unpublished work of Levorson and Gerk, and the list in Stauffer and Thiel (1941)."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 23684: authorized by Steven Holland, entered by Tori Hanson on 18.07.2002, edited by Pete Wagner

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Gastropoda
 Murchisoniina - Eotomariidae
Liospira micula
Liospira micula Hall and Whitney 1862 snail
 Murchisoniina - Hormotomidae
Hormotoma gracilis, "Hormotoma mulivolvis" = Hormotoma multivolvis
Hormotoma gracilis Hall 1847 snail
"Hormotoma mulivolvis" = Hormotoma multivolvis Billings 1857 snail
 Murchisoniina - Lophospiridae
Eunema quadrisulcata
Eunema quadrisulcata Ulrich and Scofield 1897 snail
[entered as Lophospira quadricucata]
 Murchisoniina - Straparollinidae
"Meekospira subconica" = Daidia subconica
"Meekospira subconica" = Daidia subconica Ulrich and Scofield 1897 snail
 Bellerophontida - Bucaniidae
"Salpingostoma imbricatum" = Salpingostoma imbricata, Phragmolites dyeri
"Salpingostoma imbricatum" = Salpingostoma imbricata Ulrich and Scofield 1897 snail
Phragmolites dyeri Hall 1872 snail
 Bellerophontida - Sinuitidae
Sinuites cancellatus, "Sinuites concinnus" = Sinuites subcompressa
Sinuites cancellatus Hall 1847 snail
"Sinuites concinnus" = Sinuites subcompressa Ulrich and Scofield 1897 snail
Bivalvia
 Nuculanida - Cucullellidae
Nuculites sp.
Nuculites sp. Conrad 1841 clam
 Nuculanida - Malletiidae
Palaeoneilo sp.
Palaeoneilo sp. Hall and Whitfield 1869 clam
 Nuculida - Praenuculidae
Similodonta sp.
Similodonta sp. Soot-Ryen 1964 clam
 Modiomorphida - Modiomorphidae
Prolobella sp., Saffordia sp., Orthodesma sp., Modiolopsis sp.
Prolobella sp. Ulrich 1894 clam
Saffordia sp. Ulrich 1894 clam
Orthodesma sp. Hall and Whitfield 1875 clam
Modiolopsis sp. Hall 1847 clam
 Myalinida - Ambonychiidae
Ambonychiopsis sp.
Ambonychiopsis sp. Isberg 1934 clam
 Cyrtodontida - Cyrtodontidae
Cyrtodontula sp., Cyrtodonta sp.
Cyrtodontula sp. Tomlin 1931 clam
Cyrtodonta sp. Billings 1858 clam
Tergomya
 Archinacellida - Archinacellidae
Archinacella deleta
Archinacella deleta Sardeson 1892
"Archinacella" delets
 Cyrtonellida - Cyrtolitidae
Cyrtolites disjunctus
Cyrtolites disjunctus Ulrich and Scofield 1897