M1163 - McGinty Point section: Oligocene, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Bivalvia
- Nuculanida
- Yoldiidae
|
||||||||||
|
Yoldia sp.
Möller 1842
|
||||||||||
|
Bivalvia
- Cardiida
- Tellinidae
|
||||||||||
|
Macoma sp.
Leach 1819
|
||||||||||
|
Bivalvia
- Cardiida
- Cardiidae
|
||||||||||
|
Nemocardium sp.
Meek 1876
|
||||||||||
|
Bivalvia
- Thraciida
- Periplomatidae
|
||||||||||
|
Periploma sp.
Schumacher 1816
|
||||||||||
|
Bivalvia
- Ostreida
- Ostreidae
|
||||||||||
|
Ostrea cf. tigiliana
|
||||||||||
|
= Ostreidae indet.
Rafinesque 1815
|
Hendy 2020 | |||||||||
| Significantly younger than accepted age range. | ||||||||||
|
Gastropoda
- Naticidae
|
||||||||||
|
Natica sp.
Scopoli 1777
|
||||||||||
|
Gastropoda
- Neogastropoda
- Ptychatractidae
|
||||||||||
|
? Exilia sp.
Conrad 1860
|
||||||||||
|
Gastropoda
- Neogastropoda
- Buccinidae
|
||||||||||
|
Siphonalia aff. sakakurai
Mizuno 1954
|
||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Alaska | County: | Aleutians East |
| Coordinates: | 55.5° North, 161.0° West (view map) | ||||
| Paleocoordinates: | 58.7° North, 154.9° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Paleogene | Epoch: | Oligocene |
| 10 m.y. bin: | Cenozoic 4 | ||
| Key time interval: | Oligocene | ||
| Age range of interval: | 33.9 - 23.03 m.y. ago |
Stratigraphy
| Geological group: | Beaver Bay | Formation: | Stepovak | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: These exposures were examined along the west shore of Beaver Bay from near the mouth of the Beaver River to McGinty Point. Except for the upper few hundred feet the rocks are all part of the Oligocene Stepovak Formation. The formation is at least 15,00 ft thick in this area and is underlain by up to 5000 ft of the Eocene of Tolstoi Formation. From lower in section than collections M1172, M1173 and M1188. | |||||
Lithology and environment
| Primary lithology: | concretionary,black lithified "shale" |
| Includes fossils? | Y |
| Lithology description: Black shale and siltstone with many calcareous concretions. Interbedded with sandstones and few conglomerates. | |
| Environment: | marine indet. |
| Geology comments: No paleoenvironmental data reported. | |
Taphonomy
| Modes of preservation: | body,concretion |
| 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 F.S. MacNeil and D. Taylor (USGS), 1962. Collections are reposited at USGS Menlo Park, or presumably USNM (not reported) | |
| Taxonomic list comments:No other fossils mentioned. | |
Metadata
| Also known as: | M1163 | ||
| Database number: | 44081 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2004-08-31 21:35:08 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2004-08-31 21:35:08 |
| 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] |
Secondary references:
| 63217 | A. J. W. Hendy. 2020. Unpublished taxonomic backbone for Eastern Pacific Invertebrate Communities of the Cenozoic (EPICC) Thematic Collections Network. [A. Hendy/A. Hendy/A. Hendy] |