Ivishak River (USGS Mes. loc. 22764): Callovian, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Brachiopoda indet.
Cuvier 1805
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus sp.
Sowerby 1814
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| "spp." | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Alaska |
| Coordinates: | 69.0° North, 148.1° West (view map) | ||
| Paleocoordinates: | 71.8° North, 50.9° West | ||
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Middle Jurassic |
| Stage: | Callovian | 10 m.y. bin: | Jurassic 5 |
| *Period: | Late/Upper Jurassic | *Epoch: | Dogger |
| Key time interval: | Callovian | ||
| Age range of interval: | 165.30000 - 161.50000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Kingak Shale | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Within lower 400 ft of Kingak Shale. | |||||
Lithology and environment
| Primary lithology: | concretionary,pyritic lithified siltstone | ||
| Secondary lithology: | "shale" | ||
| Lithology description: pyritic siltstone and shale containing large spheroidal concretions. | |||
| Environment: | marine indet. | Tectonic setting: | foreland basin |
| Geology comments: "[These sediments] were deposited in an eastward-trending trough about 150 mi wide...the trough was bounded on the S by a rising landmass from which most of the sediments were derived. It was bounded on the N by the Barrow Platform..." [ergo, foreland basin] | |||
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USGS |
Metadata
| Database number: | 5227 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers | Research group: | marine invertebrate |
| Created: | 1999-09-02 17:37:15 | Last modified: | 2001-08-30 17:52:51 |
| Access level: | the public | Released: | 2000-11-20 13:53:25 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 313. | R. W. Imlay. 1955. Characteristic Jurassic Mollusks from northern Alaska. United States Geological Survey Professional Paper 274-D:69-96 [J. Alroy/M. Sommers] |