USGS M6592, Sitkinak Island: Chattian, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Carditida
- Carditidae
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Cyclocardia cf. tokunagai
(Yokoyama 1924)
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Bivalvia
- Hiatellida
- Hiatellidae
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Hiatella arctica
(Linnaeus 1767)
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Bivalvia
- Pholadida
- Myidae
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? Mya sp.
Linnaeus 1758
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Bivalvia
- Cardiida
- Mactridae
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Spisula sp.
Gray 1837
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Spisula cf. hannibali
Clark and Arnold 1923
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Bivalvia
- Cardiida
- Cardiidae
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Clinocardium cf. hannibali
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Clinocardium cf. makiyamae
(Kamada 1962)
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Gastropoda
- Turritellidae
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Turritella (Hataiella) sp.
Kotaka 1959
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| spelled with current rank as Hataiella | ||||||||||
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Gastropoda
- Neogastropoda
- Buccinidae
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Buccinum aff. kurodai
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Buccinum cf. pemphigus
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| Subspecies: Buccinum cf. pemphigus major | ||||||||||
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Ancistrolepis aff. beringianus
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Ancistrolepis sp.
Dall 1895
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| Ancistrolepis sp. C | ||||||||||
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Gastropoda
- Neogastropoda
- Volutidae
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Musashia (Musashia) sp.
Hayashi 1966
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Gastropoda
- Naticidae
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Natica (Cryptonatica) clausa
(Broderip and Sowerby 1829)
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| synonym of Cryptonatica affinis | ||||||||||
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Cephalopoda
- Nautilida
- Aturiidae
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Aturia angustata
(Conrad 1849)
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| original and current combination Nautilus angustatus | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Alaska | County: | Kodiak |
| Coordinates: | 56.5° North, 154.3° West (view map) | ||||
| Paleocoordinates: | 58.5° North, 148.0° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| Stage: | Chattian | 10 m.y. bin: | Cenozoic 4 |
| Key time interval: | Chattian | ||
| Age range of interval: | 27.82000 - 23.03000 m.y. ago |
Stratigraphy
| Formation: | Narrow Cape | ||||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Unknown stratigraphic position within Narrow Cape Formation. Late Oligocene or early Miocene age. Overlies Early Oligocene Sitkinak Formation. Total thickness of formation about 210 m. The mollusks of the Narrow Cape Formation on Sitkinak Island are referable to the Juanian Stage of the provincial molluscan chronology of the Pacific Northwest (Oregon and Washington) (Addicott, 1976b; Allison, 1978). The Juanian Stage is coeval with the Echinophoria apta Zone of the Pacific Northwest (Armentrout, 1975; Addicott, 1976b; Allison, 1978) and is mostly of late Oligocene age and partly of early Miocene age (Allison, 1976, 1978). The Narrow Cape Formation on Sitkinak Island is older than the type Narrow Cape Formation of Kodiak Island. Echinophoria (=Liracassis) apta zone and type Juanian stage in the Pysht and Lincoln Creek Formations dated as Late Oligocene only by magnetostratigraphy in Prothero et al. (2003). | |||||
Lithology and environment
| Primary lithology: | concretionary,pebbly poorly lithified siltstone |
| Includes fossils? | Y |
| Lithology description: Mainly siltstone with some beds contaioning scattered pebbles and cobbles, and scattered to locally abundant calcareous concretions. Occasional thin beds of very fine sandstone. Megafossils throughout siltstone and commonly in concretions. | |
| Environment: | offshore |
| Geology comments: The overlap of bathymetric data in table 4 indicates that the Narrow Cape Formation on Sitkinak Island accumulated in the outer neritic zone between depths of about 100 and 186m. Benthic foraminifers from four localities (table 2) suggest outer neritic depths of 100 to 200m (Kristin McDougall, oral commun., 1979). | |
Taphonomy
| Modes of preservation: | body,concretion |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some microfossils |
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | USNM |
| Collection method comments: Collections housed in USGS, Menlo Park; University of Alaska, and USNM | |
| Taxonomic list comments:Representative of mollusca; foraminifera listed in reference for some localities but are not entered. | |
Metadata
| Database number: | 37662 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | M. Clapham | Research group: | marine invertebrate |
| Created: | 2004-03-19 17:51:17 | Last modified: | 2019-09-10 18:34:10 |
| Access level: | the public | Released: | 2004-03-19 17:51:17 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 10059. | R. C. Allison and L. Marincovich. 1981. A late Oligocene or earliest Miocene molluscan fauna from Sitkinak Island, Alaska. United States Geological Survey Professional Paper 1233:1-11 [A. Miller/A. Hendy/M. Krause] |