M1236 - Lake Creek section: Tithonian, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Pectinida
- Buchiidae
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Buchia piochii
(Gabb 1864)
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Cephalopoda
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Coleoidea indet.
Bather 1888
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| see common names | |||||||
Geography
| Country: | United States | State/province: | Alaska |
| Coordinates: | 55.7° North, 161.1° West (view map) | ||
| Paleocoordinates: | 40.4° North, 98.9° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | outcrop |
Time
| Period: | Jurassic | Epoch: | Late Jurassic |
| Stage: | Tithonian | 10 m.y. bin: | Jurassic 6 |
| Key time interval: | Tithonian | ||
| Age range of interval: | 149.2 - 145 m.y. ago |
Stratigraphy
| Formation: | Staniukovich | ||||
| Local section: | Lake Creek | ||||
| Regional section: | Aleutians East | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Exposures only fair to poor, but the best locally available. Beds dip consistently southwest. Collection from Staniukovich Formation near base of section. Staniukovich Formation locally exceeds 850 feet and comprises sandstones with some siltstone and claystone in upper part. Listed as Portlandian in age = Tithonian. | |||||
Lithology and environment
| Primary lithology: | fine,medium,brown,gray,green argillaceous sandstone |
| Secondary lithology: | brown,gray,green siltstone |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: Sandstone and siltstone, gray green to brown or tan, weathering yellowish tan, medium- to fine grained, moderately well sorted, argillaceous, locally feldspathic with few streaks of shaly siltstone and claystone. | |
| Environment: | marine indet. |
| Geology comments: No paleoenvironmental data reported. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: Collections examined by D. Jones (USGS), 1962. Collections are reposited at USGS Menlo Park, or presumably USNM (not reported) | |
Metadata
| Also known as: | M1236 | ||
| Database number: | 44066 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-31 16:09:45 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-08-31 16:09:45 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 11565. | C.A. Burk. 1965. Geology of the Alaska Peninsula-island arc and continental margin (Part 1). Geological Society of America Memoir 99(1) [A. Miller/A. Hendy/A. Hendy] |