Decorah Shale Pelecypods, Minnesota: Rocklandian - Shermanian, Minnesota

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Nuculida - Praenuculidae
Similodonta sp. Soot-Ryen 1964
Bivalvia - Nuculida - Cardiolariidae
Deceptrix sp. Fuchs 1919
Bivalvia - Solemyida - Ctenodontidae
Ctenodonta sp. Salter 1852
Tancrediopsis sp. (Beushausen 1895)
Bivalvia - Nuculanida - Malletiidae
Palaeoneilo sp. Hall and Whitfield 1869
Bivalvia - Modiomorphida - Modiomorphidae
Modiolopsis sp. Hall 1847
Aristerella sp. Ulrich 1894
Orthodesma sp. Hall and Whitfield 1875
Colpomya sp. Ulrich 1893
Modiolodon sp. Ulrich 1894
Bivalvia - Megalodontida - Plethocardiidae
Plethocardia sp.
Bivalvia - Lyrodesmatidae
Lyrodesma sp. Conrad 1841
Bivalvia - Cyrtodontida - Cyrtodontidae
Cyrtodonta sp. Billings 1858
Cyrtodontula sp. Tomlin 1931
Vanuxemia sp. Billings 1858
see common names

Geography
Country:United States State/province:Minnesota
Coordinates: 44.5° North, 93.0° West (view map)
Paleocoordinates:18.3° South, 63.0° West
Basis of coordinate:estimated from map
Geographic resolution:basin
Time
Period: Ordovician Epoch: Late Ordovician
10 m.y. bin: Ordovician 4-5
*Period:Middle Ordovician - Late/Upper Ordovician *Local age/stage:Rocklandian - Shermanian
Key time interval: Rocklandian - Shermanian
Age range of interval: 457 - 449.8 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Galena Formation:Decorah Shale
Stratigraphic resolution:formation
Lithology and environment
Primary lithology: "shale"
Includes fossils?Y
Lithology description: "[G]reenish-gray to pale-olive fossiliferous shale or claystone with lenses and think beds of coquinoidal limestone and calcareous shale." Lithology from W. F. Rice. 1987. The systematics and biostratigraphy of the Brachiopoda of the Decorah Shale at St. Paul, Minnesota. Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 :136-166. 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 excludes:species names
Collection methods:survey of museum collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: The fauna is not dominated in diversity by any one subclass of pelecypods. "Where possible, stratigraphic information is taken from museum labels; where this is not possible, it is taken from Bassler (1915)."
Metadata
Database number:23550
Authorizer:S. Holland Enterer:T. Hanson
Modifier:T. Hanson Research group:marine invertebrate
Created:2002-07-16 14:34:53 Last modified:2003-07-18 18:05:03
Access level:the public Released:2002-07-16 14:34:53
Creative Commons license:CC BY
Reference information

Primary reference:
6733. J., J.r. Pojeta. 1987. Ordovician pelecypods from the Upper Mississippi Valley. In R. E. Sloan (ed.), Middle and Late Ordovician lithostratigraphy and biostratigraphy of the Upper Mississippi Valley: Minnesota Geological Survey Report of Investigations 35 182-182 [S. Holland/T. Hanson/P. Wagner]