Fort Atkinson, Maquoketa group: Richmondian, Iowa
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Crinoidea
- Homocrinida
- Homocrinidae
|
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Iowa |
| Coordinates: | 43.1° North, 91.9° West (view map) | ||
| Paleocoordinates: | 18.9° South, 115.2° West (Wright 2013) | ||
| Basis of coordinate: | estimated from map |
Time
| Period: | Ordovician | Epoch: | Late Ordovician |
| Stage: | Katian | 10 m.y. bin: | Ordovician 5 |
| Key time interval: | Richmondian | ||
| Age range of interval: | 449.6 - 445.5 m.y. ago |
Stratigraphy
| Geological group: | Maquoketa | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: "Wykoff Limestone, Maquoketa Group", in Ulrich (1924) | |||||
Lithology and environment
| Primary lithology: | "limestone" |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Collection excludes: | some genera |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Database number: | 173365 | ||
| Authorizer: | B. Kröger | Enterer: | B. Kröger | Research group: | marine invertebrate |
| Created: | 2015-09-21 04:47:32 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2015-09-21 04:47:32 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 22869. | E. O. Ulrich. 1925. New classification of the "Heterocrinidae". Canada Geological Survey, Memoir 138:82-106 [G. Webster/G. Webster/S. Cole] |