Maquoketa Formation, Elgin Member Gastropoda and Monoplacophora, Minnesota (Ordovician to of the United States)

Where: Minnesota (46.0° N, 94.0° W: paleocoordinates 16.8° S, 62.3° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Elgin Member (Maquoketa Formation), Edenian to Edenian (460.9 - 449.5 Ma)

• member-level stratigraphic resolution

Environment/lithology: shale and limestone

• Environmental call by T. Hanson
• Shale interbedded with limestone; sometimes dolomitic. 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. 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on a review of the Sardeson Collection at the University of Minnesota, Weiss (1953), Ulrich and Scofield (1895), the unpublished work of Levorson and Gerk, and the list in Stauffer and Thiel (1941)."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 23603: authorized by Steven Holland, entered by Tori Hanson on 17.07.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Tergomya
 Archinacellida - Archinacellidae
Archinacella deleta Sardeson 1892
"Archinacella" deleta
 Cyrtonellida - Cyrtolitidae
Cyrtolites disjunctus Ulrich and Scofield 1897
Gastropoda
 Murchisoniina - Loxonematidae
"Hormotoma trentonensis" = Omospira trentonensis
"Hormotoma trentonensis" = Omospira trentonensis Ulrich and Scofield 1897 snail
 Murchisoniina - Hormotomidae
"Michelia oehlerti" = Hormotoma oehlerti, Hormotoma gracilis
"Michelia oehlerti" = Hormotoma oehlerti Ulrich and Scofield 1897 snail
Hormotoma gracilis Hall 1847 snail
 Murchisoniina - Lophospiridae
Eunema quadrisulcata Ulrich and Scofield 1897 snail
[entered as Lophospira quadricucata]
 Murchisoniina - Eotomariidae
Liospira micula Hall and Whitney 1862 snail
 Murchisoniina - Straparollinidae
"Meekospira subconica" = Daidia subconica
"Meekospira subconica" = Daidia subconica Ulrich and Scofield 1897 snail
 Bellerophontida - Sinuitidae
Sinuites cancellatus Hall 1847 snail
"Sinuites concinnus" = Sinuites subcompressa Ulrich and Scofield 1897 snail
 Bellerophontida - Bucaniidae
Phragmolites dyeri, "Salpingostoma imbricatum" = Salpingostoma imbricata
Phragmolites dyeri Hall 1872 snail
"Salpingostoma imbricatum" = Salpingostoma imbricata Ulrich and Scofield 1897 snail
Bivalvia
 Cyrtodontida - Cyrtodontidae
Matheria sp. Billings 1858 clam
Cyrtodonta sp. Billings 1858 clam
Cyrtodontula sp. Tomlin 1931 clam
 Myalinida - Ambonychiidae
Ambonychiopsis sp. Isberg 1934 clam
 Ostreida - Pterineidae
Pterinea sp. Goldfuss 1832 oyster
"Pterinea" sp.
 Modiomorphida - Modiomorphidae
Orthodesma sp. Hall and Whitfield 1875 clam
Modiolopsis sp. Hall 1847 clam
 Nuculida - Praenuculidae
Similodonta sp. Soot-Ryen 1964 clam
 Nuculanida - Cucullellidae
Nuculites sp. Conrad 1841 clam
 Nuculanida - Malletiidae
Palaeoneilo sp. Hall and Whitfield 1869 clam