USGS Mesozoic loc. 20751, Iniskin Peninsula, Cook Inlet: Bathonian, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia
- Mytilida
- Mytilidae
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Modiolus sp.
(Lamarck 1801)
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus sp.
Sowerby 1814
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Cephalopoda
- Ammonitida
- Cardioceratidae
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Arctocephalites (? Cranocephalites) sp.
()
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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: | 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: | 68807 | ||
Authorizer: | M. Aberhan | Enterer: | S. Nurnberg |
Modifier: | S. Nurnberg | Research group: | marine invertebrate |
Created: | 2007-02-08 00:17:45 | Last modified: | 2007-02-15 02:54:05 |
Access level: | the public | Released: | 2007-02-08 00:17:45 |
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] |