Sardeson Collection, Dunleith Formation, Sherwood Member, Illinois and Iowa: Shermanian, Illinois, Iowa

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Phacopida - Encrinuridae
Encrinuroides vigilans (Hall 1847)
recombined as Erratencrinurus vigilans
Trilobita - Phacopida - Cheiruridae
Ceraurus pleurexanthemus Green 1832
Trilobita - Asaphida - Asaphidae
Isotelus gigas (Dekay 1824)
recombined as Asaphus gigas
Trilobita - Corynexochida - Illaenidae
Illaenus sp. Dalman 1827
Rhynchonellata - Orthida - Plaesiomyidae
Plaesiomys meedsi (Winchell and Schuchert 1892)
recombined as Dinorthis meedsi
Rhynchonellata - Orthida - Glyptorthidae
Glyptorthis bellarugosa (Conrad 1843)
Rhynchonellata - Orthida - Hesperorthidae
Hesperorthis tricenaria (Conrad 1843)
Rhynchonellata - Orthida - Dalmanellidae
Paucicrura rogata (Sardeson 1892)
Rhynchonellata - Atrypida - Anazygidae
Zygospira recurvirostris (Hall 1847)
recombined as Anazyga recurvirostra
Zygospira uphami
Rhynchonellata - Atrypida - Cyclospiridae
Cyclospira bisulcata (Emmons 1842)
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Lepidocyclus capax (Conrad 1842)
recombined as Hiscobeccus capax
Rhynchonellata - Pentamerida - Parastrophinidae
Parastrophina bernensis
Strophomenata - Strophomenida - Rafinesquinidae
Rafinesquina deltoidea (Conrad 1838)
Strophomenata - Strophomenida - Strophomenidae
Strophomena trilobita (Owen 1852)
recombined as Strophomena trilobata
Strophomenata - Strophomenida - Sowerbyellidae
Sowerbyella minnesotensis (Sardeson 1892)
Lingulata - Lingulida - Discinidae
Orbiculoidea pelopea
Lingulata - Lingulida - Pseudolingulidae
? Pseudolingula iowensis (Owen 1844)
Lingulata - Lingulida - Obolidae
Palaeoglossa hurlburti
Lingulata - Lingulida - Lingulasmatidae
Lingulasma galenensis
see common names

Geography
Country:United States State/province:Illinois, Iowa
Coordinates: 42.0° North, 90.5° West (view map)
Paleocoordinates:21.3° South, 63.6° West
Basis of coordinate:estimated from map
Geographic resolution:basin
Time
Period:Ordovician Epoch:Late/Upper Ordovician
10 m.y. bin:Ordovician 4-5
*Period:Middle Ordovician - Late/Upper Ordovician *Local age/stage:Shermanian
Key time interval:Shermanian
Age range of interval:457.00000 - 449.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Galena Formation:Dunleith Member:Sherwood
Stratigraphic resolution:member
Lithology and environment
Primary lithology: calcareous "limestone"
Includes fossils?Y
Lithology description: 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:23804
Authorizer:S. Holland Enterer:T. Hanson
Modifier:S. Holland Research group:marine invertebrate
Created:2002-07-21 17:10:18 Last modified:2004-10-22 12:59:58
Access level:the public Released:2002-07-21 17:10:18
Creative Commons license:CC BY
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]