USGS Mesozoic loc. 24117, Little Nelchina River, Talkeetna Mts., Cook Inlet: Bathonian, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea sp.
Linnaeus 1758
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Bivalvia
- Ostreida
- Gryphaeidae
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Gryphaea sp.
Lamarck 1801
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus cf. porrectus
Voronetz 1937
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Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia sp.
Bruguière 1789
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Bivalvia
- Thraciida
- Thraciidae
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Thracia semiplanata
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Bivalvia
- Pholadida
- Pleuromyidae
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Pleuromya sp.
(Meek 1873)
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| original and current combination Myacites (Pleuromya) | ||||||||||
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Bivalvia
- Carditida
- Astartidae
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Astarte carlottensis
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Cephalopoda
- Ammonitida
- Cardioceratidae
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Arctocephalites (Cranocephalites) costidensus
Imlay 1962
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Cephalopoda
- Ammonitida
- Reineckeiidae
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Parareineckeia cf. shelikofana
(Imlay 1953)
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Cephalopoda
- Phylloceratida
- Phylloceratidae
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Holcophylloceras sp.
Spath 1927
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Cephalopoda
- Belemnitida
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Belemnitida indet.
Zittel 1895
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| Belemnite fragments | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Alaska |
| Coordinates: | 62.1° North, 147.7° West (view map) | ||
| Paleocoordinates: | 30.5° North, 81.8° West | ||
| Basis of coordinate: | stated in text | ||
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Middle Jurassic |
| Stage: | Bathonian | 10 m.y. bin: | Jurassic 4 |
| Key time interval: | Bathonian | ||
| Age range of interval: | 168.20000 - 165.30000 m.y. ago |
Stratigraphy
| Formation: | Tuxedni | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: upper part of Tuxedni formation 400-800 ft below base of Chinitna formation;
Cranocephalites beds, 'the beds could be either Bathonian or earliest Callovian or both... the Arctocephalites (Cranocephalites) beds in Alaska or Montana are herein tentatively correlated with the Bathonian rather than the Callovian stage' | |||||
Lithology and environment
| Primary lithology: | lithified "siliciclastic" |
| Lithology description: probably siliciclastic (based on other localities within the Tuxedni formation) | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
| Collection method comments: collection was made by A. Grantz, R. W. Imlay and others in 1952 | |
Metadata
| Database number: | 68761 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2007-02-06 04:56:30 | Last modified: | 2007-02-15 02:42:12 |
| Access level: | the public | Released: | 2007-02-06 04:56:30 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 19843. | 1% | R. W. Imlay. 1962. Jurassic (Bathonian or Early Callovian) Ammonites from Alaska and Montana. Geological Survey Professional Paper 374-C:1-32 [M. Aberhan/S. Nurnberg] |