Shell Pine Unit #43-22A, 9478'-9481': Tulean, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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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 informal sp. indet.
Salter 1866
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Gastropoda
- Euomphalina
- Macluritidae
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Lecanospira (Barnesella) aff. affinis
(Billings 1865)
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| recombined as Teiichispira affinis | ||||||||||
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Gastropoda
- Sinuopeidae
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Rhombella aff. umbilicata
(Dake and Bridge 1932)
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| recombined as Euconia umbilicata | ||||||||||
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Gastropoda
- Murchisoniina
- Hormotomidae
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Plethospira informal sp. indet.
Ulrich and Scofield 1897
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Trilobita
- Asaphida
- Asaphidae
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Aulacoparia (Praecoparia) wibauxensis
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| very abundant | ||||||||||
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Aulacoparia (Aulacoparina) impressa
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| rare | ||||||||||
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Ptyocephalus montanensis
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Presbynileus informal sp. indet.
Hintze 1954
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Trilobita
- Asaphida
- Remopleurididae
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Apatokephalus informal sp. indet.
Brögger 1896
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Trilobita
- Proetida
- Bathyuridae
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Licnocephala informal sp. A
Ross 1951
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Trilobita
- Proetida
- Hystricuridae
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Hystricurus informal sp. A
Raymond 1913
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Psalikilus paraspinosum
Hintze 1953
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana | County: | Wibaux |
| Coordinates: | 47.2° North, 110.2° West (view map) | ||||
| Paleocoordinates: | 7.4° South, 75.6° West | ||||
| Basis of coordinate: | based on political unit | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Early/Lower Ordovician |
| 10 m.y. bin: | Ordovician 1-2 | ||
| Key time interval: | Tulean | Trilobite zone: | Hintzeia celsaora |
| Age range of interval: | 480.30000 - 473.90000 m.y. ago |
Stratigraphy
Lithology and environment
| Primary lithology: | fine,micaceous,brown,gray "limestone" | ||
| Lithology description: dark gray-brown, fine-grained limestone with patches of sparry calcite, small (1 to 2 mm) lenses of green greasy micaceous clay with scattered carbonate rhombs; small pyrite blebs; very abundant trilobite pieces, about half showing wear | |||
| Environment: | lagoonal | Tectonic setting: | passive margin |
| Geology comments: "sh, ls and congl., some ss. shelf lagoon, near shoreface. BA2. Cratonic shelf" | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 174361 | ||
| Authorizer: | P. Wagner | Enterer: | P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2015-11-10 23:11:40 | Last modified: | 2020-06-18 12:29:40 |
| Access level: | the public | Released: | 2015-11-10 23:11:40 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 13452. | C. Lochman. 1966. Lower Ordovician (Arenig) faunas from the Williston Basin, Montana and North Dakota. Journal of Paleontology 40(3):512-548 [P. Wagner/P. Wagner/P. Wagner] |