District of Mackenzie, Esbataottine Mountain Dimeropyge Biofacies (P-1520): Chazyan, Canada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita
- Asaphida
- Remopleurididae
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Remopleurides pattersoni
Chatterton and Ludvigsen 1976
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9 individuals | ||||||
Trilobita
- Asaphida
- Asaphidae
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Isotelus parvirugosus
Chatterton and Ludvigsen 1976
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12 individuals | ||||||
Nahannia mediocrisulcata
Chatterton and Ludvigsen 1976
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2 individuals | ||||||
Trilobita
- Phacopida
- Pterygometopidae
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Calyptaulax callirachis
(Cooper 1953)
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67 individuals | ||||||
Trilobita
- Phacopida
- Cheiruridae
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Holia secristi
Whittington and Evitt 1953
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4 individuals | ||||||
= Holia glabra
Adrain 1998
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Adrain 1998 | ||||||
Sphaerexochus arenosus
Chatterton and Ludvigsen 1976
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1 individual | ||||||
Ceraurinella nahanniensis
Chatterton and Ludvigsen 1976
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2 individuals | ||||||
Acanthoparypha echinoderma
Chatterton and Ludvigsen 1976
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10 individuals | ||||||
Trilobita
- Phacopida
- Encrinuridae
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Cybeloides cimelia
Chatterton and Ludvigsen 1976
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6 individuals | ||||||
Trilobita
- Corynexochida
- Illaenidae
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Nanillaenus aduncus
Chatterton and Ludvigsen 1976
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2 individuals | ||||||
Bumastus (Bumastoides) lenzi
Chatterton and Ludvigsen 1976
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11 individuals | ||||||
recombined as Bumastoides lenzi | |||||||
Trilobita
- Corynexochida
- Styginidae
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Failleana calva
Chatterton and Ludvigsen 1976
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1 individual | ||||||
Trilobita
- Odontopleurida
- Odontopleuridae
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Apianurus parabarbatus
Chatterton and Ludvigsen 1976
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3 individuals | ||||||
Trilobita
- Proetida
- Telephinidae
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Carrickia pinguimitra
Chatterton and Ludvigsen 1976
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8 individuals | ||||||
recombined as Phorocephala pinguimitra | |||||||
Trilobita
- Proetida
- Dimeropygidae
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Dimeropyge clintonensis
Shaw 1968
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124 individuals | ||||||
= Dimeropyge speyeri
Chatterton 1994
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Chatterton 1994 | ||||||
Trilobita
- Harpetida
- Harpetidae
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Dolichoharpes aff. reticulata
Whittington 1949
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3 individuals | ||||||
Trilobita
- Lichida
- Lichidae
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Amphilichas conradi
Chatterton and Ludvigsen 1976
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1 individual | ||||||
see common names |
Geography
Country: | Canada | State/province: | Northwest Territories | County: | District of Mackenzie |
Coordinates: | 61.7° North, 125.9° West (view map) | ||||
Paleocoordinates: | 5.6° North, 59.9° West | ||||
Basis of coordinate: | stated in text | ||||
Geographic resolution: | outcrop |
Time
Period: | Ordovician | Epoch: | Middle Ordovician |
Stage: | Darriwilian | ||
*Period: | Middle Ordovician | *Local age/stage: | Chazyan |
Key time interval: | Chazyan | ||
Age range of interval: | 468.10000 - 460.90000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Formation: | Esbataottine | ||
Local section: | Section P | Local bed: | 1520 ft |
Local order: | bottom to top | ||
Stratigraphic resolution: | formation |
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." Possibly slightly deeper than the Calyptaulax-Ceraurinella fauna. |
Taphonomy
Modes of preservation: | replaced with silica |
Size of fossils: | macrofossils,microfossils |
Collection methods and comments
Collection excludes: | all microfossils,some macrofossils |
Collection methods: | field collection |
Reason for describing collection: | biostratigraphic analysis |
Collection method comments: Collection also includes rare ostracods and bryozoans. |
Metadata
Also known as: | P 1520, GSC loc. no. C-26317 | ||
Database number: | 26055 | ||
Authorizer: | S. Holland, P. Wagner | Enterer: | T. Hanson, P. Wagner |
Modifier: | M. Hopkins | Research group: | marine invertebrate |
Created: | 2002-10-01 13:31:15 | Last modified: | 2011-03-08 11:11:42 |
Access level: | the public | Released: | 2002-10-01 13:31:15 |
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:
23766 | J. M. Adrain. 1998. Systematics of the Acanthoparyphinae (Trilobita), with Species from the Silurian of Arctic Canada. Journal of Paleontology 72(4):698-718 [P. Wagner/P. Wagner] | |
24619 | B.D.E. Chatterton. 1994. Ordovician proetide trilobite Dimeropyge, with a new species from northwestern Canada. Journal of Paleontology 68(3):541-556 [P. Wagner/P. Wagner] |