Sadlerochit River (USGS Mesozoic Loc. 22081): Early Bajocian, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Hildoceratidae
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Pseudolioceras sp.
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Alaska |
| Coordinates: | 69.5° North, 145.9° West (view map) | ||
| Paleocoordinates: | 69.1° North, 49.3° West | ||
| Geographic resolution: | small collection |
Time
| Period: | Jurassic | Epoch: | Middle Jurassic |
| Stage: | Bajocian | 10 m.y. bin: | Jurassic 4 |
| *Period: | Middle Jurassic | *Epoch: | Dogger |
| *International age/stage: | Early/Lower Bajocian | ||
| Key time interval: | Early Bajocian | ||
| Age range of interval: | 170.9 - 168.6 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Kingak Shale | ||||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Prob within middle third of Kingak Shale about 1700' above base of fm. | |||||
Lithology and environment
| Primary lithology: | black lithified "shale" | ||
| Lithology description: black earthy shale. | |||
| Environment: | marine indet. | Tectonic setting: | 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: | 5486 | ||
| Authorizer: | J. Alroy | Enterer: | M. Sommers | Research group: | marine invertebrate |
| Created: | 1999-10-04 15:34:15 | Last modified: | 2001-08-30 17:52:51 |
| Access level: | the public | Released: | 2000-11-20 13:53:26 |
| 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] |