Unit 8, Fort Atkinson Formation: Richmondian, Wisconsin
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Anthozoa
- Stauriida
- Streptelasmatidae
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Streptelasma sp.
Hall 1847
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Anthozoa
- Sarcinulida
- Billingsariidae
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Foerstephyllum sp.
Bassler 1950
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Rhynchonellata
- Rhynchonellida
- Rhynchotrematidae
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Lepidocyclus sp.
Wang 1949
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Hypsiptycha sp.
Wang 1949
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| Originally Hypsitrycha; assumed spelling error | ||||||||||
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Rhynchonellata
- Orthida
- Plaesiomyidae
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Plaesiomys sp.
Hall and Clarke 1892
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Strophomenata
- Strophomenida
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Strophomenida indet.
Opik 1934
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Strophomenata
- Strophomenida
- Furcitellidae
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Megamyonia sp.
Wang 1949
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Stenolaemata
- Trepostomata
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Trepostomata indet.
Ulrich 1882
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Stenolaemata
- Cryptostomata
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Cryptostomata indet.
Vine 1884
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| "Abundant" | ||||||||||
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Crinoidea
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Crinoidea indet.
Miller 1821
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| "Abundant" | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Wisconsin |
| Coordinates: | 44.0° North, 88.0° West (view map) | ||
| Paleocoordinates: | 19.7° South, 112.2° West (Wright 2013) | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
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 | Formation: | Fort Atkinson | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: "Below effective wave base"; but I'm generally skeptical of the interpretations in this paper: tends toward successional ecology within beds and eustatic changes instead of tempestites to account for limestone beds | |||||
Lithology and environment
| Primary lithology: | dolomitic,gray poorly lithified "shale" |
| Secondary lithology: | lenticular,concretionary lithified calcareous wackestone |
| Lithology description: Light gray shales (with secondary dolomite) interbedded with carbonate (wackestones and mudstones) lenses and nodules | |
| Environment: | deep subtidal shelf |
| Geology comments: Unit is 0.6 m thick | |
Taphonomy
| Modes of preservation: | body |
| Degree of concentration: | -single event |
| Size of fossils: | macrofossils,mesofossils |
| Spatial orientation: | life position |
| Articulated whole bodies: | some |
| Size sorting: | poor |
| Fragmentation: | none |
| Temporal resolution: | snapshot |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 75744 | ||
| Authorizer: | P. Novack-Gottshall | Enterer: | P. Hearn | Research group: | marine invertebrate |
| Created: | 2007-10-25 14:06:59 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2007-10-25 14:06:59 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 25598. | P. A. Sivon. 1980. Stratigraphy and paleontology of the Maquoketa Group (Upper Ordovician) at Wequiock Creek, Eastern Wisconsin. Milwaukee Public Museum Contributions in Biology and Geology 35:1-45 [P. Novack-Gottshall/P. Hearn] |