PBDB Collection

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 21.0° S, 61.8° W)

• 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on a review of the Sardeson Collection at the University of Minnesota, Weiss (1953), Ulrich and Scofield (1895), the unpublished work of Levorson and Gerk, and the list in Stauffer and Thiel (1941)."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: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

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