USGS D1982. Redbird: Early/Lower Maastrichtian, Wyoming
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Pyriporoidea indet.
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| bryozoan | ||||||||||
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Polychaeta
- Serpulimorpha
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? Diploconcha sp.
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| originally entered as "? Diploconcha sp." | ||||||||||
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Scaphopoda
- Dentaliida
- Dentaliidae
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Dentalium gracile
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Cephalopoda
- Ammonitida
- Scaphitidae
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Discoscaphites sp.
Meek 1870
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| sp. nov. | ||||||||||
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Acanthoscaphites sp.
Nowak 1911
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Hoploscaphites quadrangularis
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Cephalopoda
- Ammonitida
- Baculitidae
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Baculites baculus
Meek and Hayden 1861
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Cephalopoda
- Nautilida
- Nautilidae
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Eutrephoceras montanaense
(Meek 1876)
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Gastropoda
- Vanikoridae
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Vanikoropsis nebrascensis
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Gastropoda
- Naticidae
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Euspira obliquata
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Gastropoda
- Neogastropoda
- Melongenidae
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Serrifusus ? dakotensis
(Meek and Hayden 1856)
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| originally entered as "Serrifusus ? dakotensis" | ||||||||||
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Gastropoda
- Neogastropoda
- Maturifusidae
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Astandes densatus
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Gastropoda
- Aporrhaidae
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Drepanocheilus evansi
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| originally entered as "Drepanochilus evansi" | ||||||||||
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Gastropoda
- Heterostropha
- Ringiculidae
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Oligoptycha concinna
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Gastropoda
- Opisthobranchia
- Scaphandridae
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Ellipsoscapha occidentalis
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Bivalvia
- Nuculanida
- Nuculanidae
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Nuculana evansi
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Bivalvia
- Nuculida
- Nuculidae
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Nucula planimarginata
Meek and Hayden 1857
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Bivalvia
- Pholadomyida
- Pholadomyidae
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Pholadomya sp.
Sowerby 1823
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Bivalvia
- Pholadida
- Corbulidae
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Corbula crassimarginata
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Bivalvia
- Cardiida
- Veneridae
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Dosiniopsis deweyi
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Bivalvia
- Cardiida
- Cardiidae
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Protocardia sp.
(Beyrich 1845)
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Bivalvia
- Mytilida
- Crenellidae
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Crenella sp.
Brown 1827
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| sp. nov. | ||||||||||
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus meekii
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus subcircularis
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? Inoceramus cf. fibrosus
(Meek and Hayden 1857)
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| originally entered as "? Inoceramus cf. fibrosus" | ||||||||||
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Bivalvia
- Pectinida
- Pectinidae
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Pecten nebrascensis
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| (Chlamys) | ||||||||||
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Bivalvia
- Pectinida
- Oxytomidae
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Oxytoma nebrascana
(Evans and Shumard 1857)
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Bivalvia
- Pectinida
- Anomiidae
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Anomia sp.
Linnaeus 1758
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Bivalvia
- Pectinida
- Entoliidae
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Syncyclonema sp.
Meek 1864
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Bivalvia
- Ostreida
- Pteriidae
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Pteria linguaeformis
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea sp.
Linnaeus 1758
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Bivalvia
- Arcida
- Cucullaeidae
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Idonearca shumardi
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| spelled with current rank as Cucullaea (Idonearca) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Wyoming | County: | Niobrara |
| Coordinates: | 43.3° North, 104.3° West (view map) | ||||
| Paleocoordinates: | 49.7° North, 79.1° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 | *Epoch: | Senonian |
| Key time interval: | Early/Lower Maastrichtian | Ammonoid zone: | Baculites baculus |
| Age range of interval: | 72.10000 - 66.00000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Pierre Shale | Member: | upper unnamed shale | ||
| Regional section: | member | Regional bed: | 260 ft | ||
| Regional order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Pierre shale, about 260' above top of Kara member; was 93 in bed/horizon. | |||||
Lithology and environment
| Primary lithology: | gray lithified silty "shale" | ||
| Secondary lithology: | "limestone" | ||
| Environment: | offshore | Tectonic setting: | cratonic basin |
| Geology comments: "Shale, silty. weathers light medium gray; contains brown weathering very fossiliferous ls concretions as much as 1.5 ft thick and 4 ft diam." | |||
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | mechanical,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
| Taxonomic list comments:"The fossils are ordinarily well-preserved. Most of the cephalopod shells and the inner nacreous layer of Inoceramus are aragonitic, especially specimens from above the Red Bird Silty Member. Shell material and specimens from the Red Bird member and the upper 50' of the underlying Mitten Member is partially transformed to calcite...Ammonites...of the [mid-upper third] of the Mitten Member are...entirely aragonite whereas shell material [of underlying material] is completely transformed to calcite." | |
Metadata
| Also known as: | Pierre Shale (USGS D1982, D1983, D1984) | ||
| Database number: | 1586 | ||
| Authorizer: | J. Alroy, P. Wagner | Enterer: | M. Sommers, P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 1999-05-17 17:33:02 | Last modified: | 2024-03-15 19:07:53 |
| Access level: | the public | Released: | 1999-05-17 17:33:02 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 45. | J. R. Gill, W. A. Cobban, and P. M. Kier. 1966. The Red Bird Section of the Upper Cretaceous Pierre Shale in Wyoming. United States Geological Survey Professional Paper 393-A:1-73 [J. Alroy/M. Sommers/A. Clement] |