Winneshiek County Road Exposure: Richmondian, Iowa
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Strophomenata
- Strophomenida
- Sowerbyellidae
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Thaerodonta aspera
Wang 1949
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| recombined as Eochonetes aspera | |||||||
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Thaerodonta recedens
(Sardeson 1892)
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Thaerodonta saxea
(Sardeson 1892)
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| synonym of Thaerodonta recedens | |||||||
| see common names | |||||||
Geography
| Country: | United States | State/province: | Iowa | County: | Winneshiek |
| Coordinates: | 43.2° North, 91.9° West (view map) | ||||
| Paleocoordinates: | 19.0° South, 60.0° West | ||||
| Basis of coordinate: | based on political unit | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Late/Upper Ordovician |
| Stage: | Katian | 10 m.y. bin: | Ordovician 5 |
| Key time interval: | Richmondian | Graptolite zone: | Amplexograptus manitoulinensis |
| Age range of interval: | 449.80000 - 446.00000 m.y. ago |
Stratigraphy
| Geological group: | Maquoketa | Formation: | Scales Shale | Member: | Elgin |
| Stratigraphic resolution: | member | ||||
| Stratigraphy comments: Was Elgin member of Maquoketa Formation | |||||
Lithology and environment
| Primary lithology: | "limestone" |
| Lithology description: Limestone, occasional shale partings. 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. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM |
Metadata
| Database number: | 183357 | ||
| Authorizer: | P. Wagner | Enterer: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2016-12-13 14:27:55 | Last modified: | 2016-12-13 14:27:55 |
| Access level: | the public | Released: | 2016-12-13 14:27:55 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 54308. | H. J. Howe. 1972. Morphology of the Brachiopod Genus Thaerodonta. Journal of Paleontology 46(3):440-446 [P. Wagner/P. Wagner] |