Section AV1, 641 m, Avalanche Lake Area, Mackenzie Mts.: Wenlock, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Strophomenata
- Strophomenida
- Furcitellidae
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Pentlandina harperi
Zhang 1989
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Strophomenata
- Strophomenida
- Leptellinidae
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Leptellina (Merciella) mackenziensis
Jin and Chatterton 1997
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Rhynchonellata
- Spiriferida
- Cyrtiidae
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Hedeina sp.
Boucot 1957
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Rhynchonellata
- Protorthida
- Skenidiidae
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Skenidioides operosa
Johnson et al. 1976
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Rhynchonellata
- Orthida
- Dicoelosiidae
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Epitomyonia clausula
Johnson et al. 1976
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Rhynchonellata
- Atrypida
- Atrypidae
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Atrypa (Gotatrypa) blodgetti
Zhang 1989
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| see common names | |||||||
Geography
| Country: | Canada | State/province: | Northwest Territories |
| Coordinates: | 62.4° North, 127.0° West (view map) | ||
| Paleocoordinates: | 6.2° North, 50.8° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Silurian | Epoch: | Wenlock |
| 10 m.y. bin: | Silurian 2 | ||
| Key time interval: | Wenlock | ||
| Age range of interval: | 433.40000 - 427.40000 m.y. ago |
Stratigraphy
| Formation: | Delorme | ||||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Authors call it Delorme Group. I'm calling it Delorme Formation for consistency with related collections. Based on position in section and faunal content, this probably correlates with Fauna x of sections AV4 and AV5. | |||||
Lithology and environment
| Primary lithology: | dolomite | ||
| Secondary lithology: | calcareous "shale" | ||
| Lithology description: For entire Whittaker/Road River/Delorme suite: "The sediments are predominantly carbonates with varying amounts of argillaceous material, ranging from fairly pure limestones, through argillaceous limestones and calcareous shales, to almost pure siliciclastic shales with some intervals containing minor to major amounts of chert." In stratigraphic column, this part of section is dolostone. | |||
| Environment: | offshore shelf | Tectonic setting: | passive margin |
| Glacial or sequence phase: | highstand systems tract | ||
| Geology comments: For entire Whittaker/Road River/Delorme suite: "The sediments were deposited in an area adjacent to the boundary between the Paleozoic continental shelf (Mackenzie shelf/platform) and the slope into the marginal Selwyn Basin."
SEP environmental call based primarily on PBDB ref. 7215. could be slope | |||
Taphonomy
| Modes of preservation: | replaced with silica |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Reason for describing collection: | taxonomic analysis |
| Taxonomic list comments:Articulate brachiopods only. | |
Metadata
| Also known as: | Probable Fauna x, Section AV1, Delorme Fm., Avalanche Lake Area, Mackenzie Mts. | ||
| Database number: | 26073 | ||
| Authorizer: | M. Foote | Enterer: | M. Foote |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2002-10-02 07:15:53 | Last modified: | 2018-04-26 00:22:10 |
| Access level: | the public | Released: | 2002-10-02 07:15:53 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 7218. | J. Jin and B. D. E. Chatterton. 1997. Latest Ordovician-Silurian articulate brachiopods and biostratigraphy of the Avalanche Lake area, southwestern District of Mackenzie, Canada. Palaeontographica Canadiana 13:1-62 [M. Foote/M. Foote/M. Foote] |