Hossfeldt Hills, locality no.236: Chesterian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Crinoidea
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Crinoidea indet.
Miller 1821
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| crinoid columnals | ||||||||||
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Rhynchonellata
- Spiriferinida
- Punctospiriferidae
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Punctospirifer sp.
North 1920
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Rhynchonellata
- Spiriferida
- Trigonotretidae
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Neospirifer sp.
Fredericks 1919
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Rhynchonellata
- Athyridida
- Athyrididae
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Composita ozarkana
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Strophomenata
- Productida
- Linoproductidae
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Linoproductus sp.
(Chao 1927)
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Strophomenata
- Productida
- Productidae
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Dictyoclostus inflatus
(McChesney 1860)
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Buxtonia sp.
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Strophomenata
- Strophomenida
- Chonetidae
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Chonetes sp.
Fischer de Waldheim 1830
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Trilobita
- Proetida
- Proetidae
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Proetidae indet.
Salter 1864
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| trilobite fragments | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana | County: | Broadwater |
| Coordinates: | 46.0° North, 111.5° West (view map) | ||||
| Paleocoordinates: | 4.0° North, 39.0° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Carboniferous | Epoch: | Mississippian |
| 10 m.y. bin: | Carboniferous 2-3 | ||
| *Period: | Early/Lower Carboniferous | *Local age/stage: | Chesterian |
| Key time interval: | Chesterian | ||
| Age range of interval: | 335.80000 - 323.20000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Big Snowy | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Author listed age as "Late Mississippian." | |||||
Lithology and environment
| Primary lithology: | poorly lithified silty,sandy,calcareous sandstone |
| Secondary lithology: | "limestone" |
| Lithology description: bewildering variety of rock types. mostly fine-grained clastic rocks and impure thin-bedded carbonate rocks; unresistant to weathering. | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body,replaced with silica |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
Metadata
| Also known as: | USGS 16440-PC | ||
| Database number: | 7320 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers |
| Modifier: | C. Visaggi | Research group: | marine invertebrate |
| Created: | 2000-05-23 15:03:44 | Last modified: | 2004-03-11 16:25:09 |
| Access level: | the public | Released: | 2000-11-20 13:53:34 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 455. | G. D. Robinson. 1963. Geology of the Three Forks Quadrangle, Montana. United States Geological Survey Professional Paper 370:1-143 [J. Alroy/M. Sommers/J. Ju] |