Decorah: Blackriveran - Kirkfieldian, Iowa
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Orthocerida
- Kionoceratidae
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Kionoceras decorahense n. sp.
Flower 1952
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1 specimen | |||||||||
| holotype: NYSM, no catalogue number given | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Iowa | County: | Winneshiek |
| Coordinates: | 43.3° North, 91.8° West (view map) | ||||
| Paleocoordinates: | 19.7° South, 63.3° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | small collection |
Time
| Period: | Ordovician | Epoch: | Late Ordovician |
| 10 m.y. bin: | Ordovician 4-5 | ||
| Key time interval: | Blackriveran - Kirkfieldian | ||
| Age range of interval: | 457 - 449.8 m.y. ago |
Stratigraphy
| Geological group: | Galena | Formation: | Decorah shale | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "Decorah shale" (Flower, 1952). Additional informations on chrono- and lithostratigraphy are from Simo et al. (2003, Geology 31(6)). | |||||
Lithology and environment
| Primary lithology: | claystone | ||
| Secondary lithology: | "limestone" | ||
| Lithology description: The Decorah shale in general is an alternation of claystones ("shales") and limestones with varying dominance of one or the other rock type. The cephalopod appears to come from a limestone bed rather than from shale. | |||
| Environment: | deep subtidal shelf | Tectonic setting: | cratonic basin |
Taphonomy
| Modes of preservation: | cast |
| Size of fossils: | macrofossils |
| Temporal resolution: | time-averaged |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | NYSM |
Metadata
| Also known as: | Upper Mississippi Valley | ||
| Database number: | 89042 | ||
| Authorizer: | B. Kröger | Enterer: | T. Liebrecht |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2009-04-29 15:48:16 | Last modified: | 2021-07-26 15:15:15 |
| Access level: | the public | Released: | 2009-04-29 15:48:16 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 29843. | R. H. Flower. 1952. New Ordovician Cephalopods from Eastern North America. Journal of Paleontology 26(1):24-59 [B. Kröger/T. Liebrecht] |