Scales Shale, Elgin Member Gastropoda and Monoplacophora, Illinois and Iowa: Edenian - Maysvillian, Illinois, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Tergomya - Archinacellida - Archinacellidae
"Archinacella" deleta
Tergomya - Cyrtonellida - Cyrtolitidae
Gastropoda - Bellerophontida - Sinuitidae
Gastropoda - Bellerophontida - Bucaniidae
Gastropoda - Murchisoniina - Hormotomidae
Gastropoda - Murchisoniina - Lophospiridae
[entered as Lophospira quadricucata]
Wagner 2023
Gastropoda - Murchisoniina - Straparollinidae
Gastropoda - Murchisoniina - Eotomariidae
Bivalvia - Cyrtodontida - Cyrtodontidae
Bivalvia - Ostreida - Pterineidae
Pterinea sp. Goldfuss 1832
"Pterinea" sp.
Bivalvia - Myalinida - Ambonychiidae
Bivalvia - Modiomorphida - Modiomorphidae
Orthodesma sp. Hall and Whitfield 1875
Saffordia sp. Ulrich 1894
Bivalvia - Nuculanida - Malletiidae
Bivalvia - Nuculanida - Cucullellidae
Bivalvia - Nuculida - Praenuculidae
Similodonta sp. Soot-Ryen 1964
see common names

Geography
Country:United States State/province:Illinois, Iowa
Coordinates: 42.0° North, 90.5° West (view map)
Paleocoordinates:11.7° South, 115.3° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:basin
Time
Period: Ordovician Epoch: Late Ordovician
Stage: Katian 10 m.y. bin: Ordovician 5
*Period:Late/Upper Ordovician *Local age/stage:Edenian - Maysvillian
Key time interval: Edenian - Maysvillian
Age range of interval: 451 - 449.6 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Maquoketa Formation:Scales Shale Member:Elgin
Lithology and environment
Primary lithology: "limestone"
Includes fossils?Y
Lithology description: Limestone, occasional shale partings. 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.
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:23682
Authorizer:S. Holland, P. Wagner Enterer:T. Hanson, P. Wagner
Modifier:T. Hanson Research group:marine invertebrate
Created:2002-07-18 16:04:16 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-07-18 16:04:16
Creative Commons license:CC0
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]