Sardeson Collection, Maquoketa Formation, Clermont Member: Maysvillian, Minnesota

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Phacopida - Calymenidae
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
Rhynchonellata - Orthida - Platyorthidae
Strophomenata - Strophomenida - Sowerbyellidae
Strophomenata - Strophomenida - Rafinesquinidae
Strophomenata - Strophomenida - Furcitellidae
Strophomenata - Strophomenida - Strophomenidae
Tetraphalerella planodorsata (Winchell and Schuchert 1892)
Lingulata - Lingulida - Obolidae
Lingulops sp. Hall 1871
Lingulata - Lingulida - Discinidae
see common names

Geography
Country:United States State/province:Minnesota
Coordinates: 45.0° North, 93.3° West (view map)
Paleocoordinates:13.1° South, 116.4° West (Wright 2013)
Basis of coordinate:based on political unit
Geographic resolution:outcrop
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 Graptolite zone: 
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
Stratigraphy comments: PJW: was given as Amplexograptus manitoulinensis zone, but the volume does not state this and Clermont is younger than that.
Lithology and environment
Primary lithology: "limestone"
Includes fossils?Y
Lithology description: Shaly limestone. 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.
Environment:carbonate indet.
Geology comments: Environmental call by T. Hanson
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:23283
Authorizer:S. Holland Enterer:T. Hanson
Modifier:P. Wagner Research group:marine invertebrate
Created:2002-07-11 11:08:21 Last modified:2025-02-22 15:12:02
Access level:the public Released:2002-07-11 11:08:21
Creative Commons license:CC0
Reference information

Primary reference:
6686. W. F. Rice and E. P. Hedblom. 1987. Brachiopods and trilobites of the Sardeson Beds in the Twin Cities. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 131-135 [S. Holland/T. Hanson/T. Hanson]