USGS Mesozoic loc. 20752, Iniskin Peninsula, Cook Inlet: Bathonian, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Arcida
- Parallelodontidae
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? Grammatodon sp.
Meek and Hayden 1860
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Bivalvia
- Pectinida
- Pectinidae
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Camptonectes sp.
Meek 1864
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Bivalvia
- Pectinida
- Oxytomidae
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Meleagrinella sp.
Whitfield 1855
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus sp.
Sowerby 1814
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Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia sp.
Bruguière 1789
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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 sp.
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? Arctocephalites alticostus
Imlay 1962
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Alaska |
| Coordinates: | 59.7° North, 153.3° West (view map) | ||
| Paleocoordinates: | 30.1° North, 86.0° West | ||
| Basis of coordinate: | estimated from map | ||
| 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 | Member: | Bowser | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: about 1300-1400 ft below base of Chinitna formation; Middle part of Bowser member, Tuxedni formation;
Cranocephalites beds, 'the beds could be of late Bathonian or very early Callovian age... 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: The Bowser member of the Tuxedni formation on the Iniskin Peninsula ranges from 1800 to 2100 feet in thickness and consists of interbedded claystone, siltstone, sandstone and conglomerate. | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | survey of museum collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
| Collection method comments: collection was made by C. E. Kirschner in 1946 | |
Metadata
| Database number: | 68808 | ||
| Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
| Modifier: | S. Nurnberg | Research group: | marine invertebrate |
| Created: | 2007-02-08 00:23:19 | Last modified: | 2007-02-15 02:54:24 |
| Access level: | the public | Released: | 2007-02-08 00:23:19 |
| 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] |