District of Mackenzie, Sunblood Mountain Bathyurus Biofacies (A-220): Blackriveran, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Rhynchonellata
- Rhynchonellida
- Trigonirhynchiidae
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Rostricellula sp.
Ulrich and Cooper 1942
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Rhynchonellata
- Pentamerida
- Camerellidae
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Camerella sp.
Billings 1859
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unclassified
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Eokloedenella whittakerensis n. sp.
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Copeland 1974 | ||||||
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Trilobita
- Lichida
- Lichidae
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Amphilichas sp.
Raymond 1905
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Trilobita
- Proetida
- Bathyuridae
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Bathyurus sp.
Billings 1859
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Trilobita
- Phacopida
- Pterygometopidae
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Calyptaulax sp.
Cooper 1930
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| see common names | |||||||
Geography
| Country: | Canada | State/province: | Northwest Territories | County: | District of Mackenzie |
| Coordinates: | 61.6° North, 125.7° West (view map) | ||||
| Paleocoordinates: | 6.8° North, 58.0° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician | Epoch: | Late Ordovician |
| 10 m.y. bin: | Ordovician 4-5 | ||
| *Period: | Middle Ordovician | *Local age/stage: | Blackriveran |
| Key time interval: | Blackriveran | ||
| Age range of interval: | 457 - 449.8 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Esbataottine | ||
| Local section: | Section A | Local bed: | 220 ft |
| Local order: | bottom to top | ||
| Stratigraphic resolution: | bed |
Lithology and environment
| Primary lithology: | argillaceous,silty "limestone" |
| Includes fossils? | Y |
| Lithology description: "[H]omogeneous sequence of micrites and microbiosparites, commonly silty and argillaceous. The bedding is regular to nodular and generally thin (3-8 cm) to medium (8-20 cm), rarely thickly bedded. Sand-size components are absent and more common biotic contributors to skeletal sands (pelmatozoans, heavy-shelled brachiopods, algae, corals, or stromatoporioids) are rare or absent." | |
| Environment: | deep subtidal indet. |
| Geology comments: "[H]omogeneous, probably soft bottom, carbonate and mud substrate, deposited under quiet water conditions on a wide shelf ranging from the littoral to, possibly, deep sub-littoral zones." | |
Taphonomy
| Modes of preservation: | body,replaced with silica |
| Size of fossils: | macrofossils,microfossils |
Collection methods and comments
| Collection excludes: | all microfossils,some macrofossils,species names |
| Collection methods: | field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: Also includes gastropods, and bryozoans. | |
Metadata
| Also known as: | A 220 | ||
| Database number: | 25925 | ||
| Authorizer: | S. Holland, M. Hopkins | Enterer: | T. Hanson, M. Hopkins |
| Modifier: | M. Hopkins | Research group: | marine invertebrate |
| Created: | 2002-09-28 17:07:04 | Last modified: | 2011-02-08 10:00:10 |
| Access level: | the public | Released: | 2002-09-28 17:07:04 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 7069. | B. D. E. Chatterton and R. Ludvigsen. 1976. Silicified Middle Ordovician trilobites from the South Nahanni River Area, District of Mackenzie, Canada. Palaeontographica Abteilung A 154(1-3):1-106 [S. Holland/T. Hanson/T. Hanson] |
Secondary references:
| 7191 | M. J. Copeland. 1974. Middle Ordovician ostracoda from southwestern District of Mackenzie. Canada Geological Survey Bulletin (244)1-55 [S. Holland/T. Hanson/T. Hanson] | |
| 7070 | R. Ludvigsen. 1975. Ordovician formations and faunas, southern Mackenzie Mountains. Canadian Journal of Earth Sciences 12:663-697 [S. Holland/T. Hanson/J. Ju] |