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

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Lingulata - Lingulida - Pseudolingulidae
? Pseudolingula iowensis (Owen 1844)
Lingulata - Lingulida - Obolidae
Pachyglossella elderi
Pachyglossella riciniformis
Lingulata - Lingulida - Trematidae
Schizocrania filosa
Craniata - Craniida - Craniidae
Petrocrania trentonensis
Acanthocrania granulosa
Craniata - Craniopsida - Craniopsidae
Craniops minor
Strophomenata - Billingsellida - Clitambonitidae
Vellamo americana
Strophomenata - Strophomenida - Sowerbyellidae
Sowerbyella curdsvillensis (Foerste 1912)
Strophomenata - Strophomenida - Furcitellidae
Oepikina minnesotensis (Winchell 1881)
Furcitella scofieldi (Winchell and Schuchert 1892)
original and current combination Strophomena scofieldi
Strophomenata - Strophomenida - Glyptomenidae
Holtedahlina emaciata Rice and Hedblom 1987
synonym of Pionomena emaciata
Strophomenata - Strophomenida - Strophomenidae
Strophomena billingsi Winchell and Schuchert 1893
Strophomenata - Strophomenida - Rafinesquinidae
Rafinesquina trentonensis (Hall 1847)
Rhynchonellata - Pentamerida - Parastrophinidae
Parastrophina bernensis
Rhynchonellata - Atrypida - Anazygidae
Zygospira recurvirostris (Hall 1847)
recombined as Anazyga recurvirostra
Rhynchonellata - Rhynchonellida - Rhynchotrematidae
Rhynchotrema wisconsinense
Rhynchotrema laticosta
Rhynchonellata - Orthida - Draboviidae
? Diorthelasma weissi Rice 1987
Pionodema circularis
Pionodema subaequata (Conrad 1843)
Rhynchonellata - Orthida - Dalmanellidae
Paucicrura rogata (Sardeson 1892)
Rhynchonellata - Orthida - Plaesiomyidae
Plaesiomys meedsi (Winchell and Schuchert 1892)
recombined as Dinorthis meedsi
Dinorthis pectinella Emmons 1842
Rhynchonellata - Orthida - Glyptorthidae
Glyptorthis bellarugosa (Conrad 1843)
Rhynchonellata - Orthida - Hesperorthidae
Hesperorthis tricenaria (Conrad 1843)
Rhynchonellata - Orthida - Platystrophiidae
Platystrophia amoena McEwan 1919
Platystrophia trentonensis McEwan 1919
Rhynchonellata - Orthida - Plectorthidae
Plectorthis plicatella (Hall 1847)
Trilobita - Corynexochida - Illaenidae
Illaenus sp. Dalman 1827
Bumastoides porrectus
Trilobita - Phacopida - Calymenidae
Flexicalymene senaria (Conrad 1841)
recombined as Flexicalymene (Flexicalymene) senaria
Trilobita - Phacopida - Pterygometopidae
Eomonorachus intermedius (Walcott 1879)
Sceptaspis lincolnensis (Branson 1909)
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
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 Conodont zone: Belodina confluens
Age range of interval:457.00000 - 449.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Galena Formation:Dunleith Member:Beecher
Stratigraphic resolution:member
Lithology and environment
Primary lithology: "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
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:23799
Authorizer:S. Holland Enterer:T. Hanson
Modifier:P. Wagner Research group:marine invertebrate
Created:2002-07-21 13:40:02 Last modified:2021-12-07 19:08:19
Access level:the public Released:2002-07-21 13:40:02
Creative Commons license:CC BY
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]

Secondary references:

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]