Bed 22, Section 1 - Lower shale-siltstone division, Aklavik Range: Berriasian, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Pholadida
- Pleuromyidae
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? Pleuromya sp.
(Meek 1873)
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Bivalvia
- Pectinida
- Buchiidae
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Aucella okensis
Pavlow 1907
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| var. elliptica | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Canada | State/province: | Northwest Territories |
| Coordinates: | 68.0° North, 135.5° West (view map) | ||
| Paleocoordinates: | 68.5° North, 66.6° West | ||
| Basis of coordinate: | stated in text | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Early Cretaceous |
| Stage: | Berriasian | 10 m.y. bin: | Cretaceous 1 |
| Key time interval: | Berriasian | ||
| Age range of interval: | 145 - 139.8 m.y. ago |
Stratigraphy
| Formation: | Lower Shale-Siltstone | Member: | Lower | ||
| Local section: | East slope of Aklavik Range | Local bed: | 479 ft | ||
| Local order: | bottom to top | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: 0.5-1 ft thick conglomerate, 471-486 ft above the base of the section; assigned to the Aucella okensis biozone; classified as "Lower Mbr" of the "lower shale-siltstone division" in Jeletzky (1958); Jeletzky (1958) assigns this unit a Berriasian age. Possibly latest Jurassic. | |||||
Lithology and environment
| Primary lithology: | fine,coarse,pebbly lithified sandy,cherty/siliceous conglomerate |
| Includes fossils? | Y |
| Lithology description: Pebble-conglomerate, fine to coarse, grey; pebbles mostly black chert, well rounded, but poorly sorted; rich in gritty and sandy matrix. | |
| Environment: | marine indet. |
| Geology comments: No environmental data reported. | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | poor |
Collection methods and comments
| Collection methods: | selective quarrying,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Museum repositories: | GSC |
| Collection method comments: Collected by Jeletzky; presumably reposited in GSC collections . | |
| Taxonomic list comments:Collection appears not to be exhaustive. | |
Metadata
| Also known as: | Field No. 22, Bed 22 | ||
| Database number: | 55873 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | A. Hendy | Research group: | marine invertebrate |
| Created: | 2005-11-07 11:04:51 | Last modified: | 2013-11-25 13:37:23 |
| Access level: | the public | Released: | 2005-11-07 11:04:51 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 15084. | J. A. Jeletzky. 1958. Uppermost Jurassic and Cretaceous rocks of Aklavik Range, Northeastern Richardson Mountains, Northwest Territories. Geological Survey of Canada, Paper 58(2):1-84 [A. Miller/A. Hendy] |