10226', Shell Oil Co., #32-33B, N.P. Unit, S.W. Richey field: Gasconadian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Pterobranchia
- Dendroidea
- Acanthograptidae
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cf. Dictyonema informal fragments
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Rhynchonellata
- Orthida
- Eoorthidae
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Apheoorthis ocha
(Walcott 1924)
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Rhynchonellata
- Orthida
- Plectorthidae
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Nanorthis putilla
(Walcott 1924)
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Lingulata
- Lingulida
- Obolidae
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Lingulella ibicus
Walcott 1924
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Trilobita
- Asaphida
- Nileidae
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Symphysurina cf. woosteri
Ulrich and Walcott 1924
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Trilobita
- Proetida
- Hystricuridae
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Hystricurus informal sp. undet.
Raymond 1913
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unclassified
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Problematica informal CaPO4 tubes
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Montana | County: | McCone |
| Coordinates: | 47.4° North, 105.6° West (view map) | ||||
| Paleocoordinates: | 10.3° South, 75.5° West | ||||
| Basis of coordinate: | based on political unit |
Time
| Period: | Ordovician | Epoch: | Early/Lower Ordovician |
| Stage: | Tremadocian | 10 m.y. bin: | Ordovician 1 |
| Key time interval: | Gasconadian | Zone: | Bellefontia - Xenostegium or Paraplethopeltis seelyi |
| Age range of interval: | 485.40000 - 477.70000 m.y. ago |
Stratigraphy
| Formation: | Deadwood | ||||
| Local section: | S.W. Richey | Local bed: | 10226 ft | ||
| Local order: | top to bottom | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Zone C or B. | |||||
Lithology and environment
| Primary lithology: | dolomitic,gray,green "limestone" | ||
| Secondary lithology: | green "shale" | ||
| Lithology description: Thin beds and lenses of gray-green fine grained dolomitic limestone, with a few large mica and pyrite blebs intercalated with dark gr | |||
| Environment: | carbonate indet. | Tectonic setting: | passive margin |
| Geology comments: "sh, ls, and congl. muddy shelf lagoon (BA2) cratonic shelf" | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
| Taxonomic list comments:"Lochman-Balk and Wilson 1967. biostrat. lists" | |
Metadata
| Also known as: | Williston Basin, Deadwood Fm., upper Tremadoc, zone d, Montana in Sepkoski 1998 | ||
| Database number: | 210717 | ||
| Authorizer: | P. Wagner | Enterer: | P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2020-06-17 14:08:38 | Last modified: | 2024-01-07 17:19:14 |
| Access level: | the public | Released: | 2020-06-17 14:08:38 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 16151. | C. Lochman. 1964. Basal Ordovician faunas from the Williston Basin, Montana. Journal of Paleontology 38(3):453-476 [P. Wagner/P. Wagner] |