Sardeson Collection, Scales Shale, Clermont Member, Illinois and Iowa: Maysvillian, Illinois, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Asaphida - Asaphidae
Isotelus susae (Whitfield 1882)
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Lepidocyclus capax (Conrad 1842)
Rhynchonellata - Atrypida - Anazygidae
Rhynchonellata - Orthida - Plectorthidae
Rhynchonellata - Orthida - Glyptorthidae
Rhynchonellata - Orthida - Plaesiomyidae
Plaesiomys proavita (Winchell and Schuchert 1892)
Rhynchonellata - Orthida - Dalmanellidae
Paucicrura rogata (Sardeson 1892)
Rhynchonellata - Orthida - Heterorthidae
Strophomenata - Strophomenida - Sowerbyellidae
Strophomenata - Strophomenida - Rafinesquinidae
Strophomenata - Strophomenida - Furcitellidae
Strophomenata - Strophomenida - Strophomenidae
Tetraphalerella planodorsata (Winchell and Schuchert 1892)
Lingulata - Lingulida - Discinidae
see common names

Geography
Country:United States State/province:Illinois, Iowa
Coordinates: 42.0° North, 90.5° West (view map)
Paleocoordinates:16.6° South, 116.8° 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:Maysvillian
Key time interval: Maysvillian
Age range of interval: 450.2 - 449.6 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Maquoketa Formation:Scales Shale Member:Clermont
Stratigraphic resolution:member
Lithology and environment
Primary lithology:green "shale"
Includes fossils?Y
Lithology description: 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.
Environment:carbonate indet.
Geology comments: Environmental call by T. Hanson.
Taphonomy
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:23811
Authorizer:S. Holland Enterer:T. Hanson
Modifier:T. Hanson Research group:marine invertebrate
Created:2002-07-21 19:18:13 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-07-21 19:18:13
Creative Commons license:CC0
Reference information

Primary reference:
6752. J. A. Catalani. 1987. Biostratigraphy of the Middle and Late Ordovician cephalopods of the Upper Mississippi Valley area. In R. E. Sloan (ed.), Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 187-189 [S. Holland/T. Hanson/S. Bruning]