District of Mackenzie, Esbataottine Mountain Dimeropyge Biofacies (P-1512): Chazyan, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Ostracoda
Ludvigsenites mackenziensis
Copeland 1974
Ostracoda - Palaeocopida - Aparchitidae
"Aparchites" sp.
Copeland 1974
Ostracoda - Podocopida - Bairdiocyprididae
Bairdiocypris cf. granti
Copeland 1974
Trilobita - Lichida - Lichidae
Amphilichas conradi Chatterton and Ludvigsen 1976
4 individuals
Trilobita - Harpetida - Harpetidae
Dolichoharpes aff. reticulata Whittington 1949
60 individuals
Trilobita - Proetida - Telephinidae
Carrickia pinguimitra Chatterton and Ludvigsen 1976
6 individuals
Trilobita - Proetida - Dimeropygidae
Dimeropyge clintonensis Shaw 1968
277 individuals
    = Dimeropyge speyeri Chatterton 1994
Chatterton 1994
Trilobita - Corynexochida - Styginidae
3 individuals
Trilobita - Corynexochida - Illaenidae
Nanillaenus aduncus Chatterton and Ludvigsen 1976
8 individuals
Bumastus (Bumastoides) lenzi Chatterton and Ludvigsen 1976
31 individuals
Trilobita - Asaphida - Remopleurididae
Remopleurides pattersoni Chatterton and Ludvigsen 1976
13 individuals
Trilobita - Asaphida - Asaphidae
Isotelus parvirugosus Chatterton and Ludvigsen 1976
17 individuals
Nahannia mediocrisulcata Chatterton and Ludvigsen 1976
2 individuals
Trilobita - Phacopida - Pterygometopidae
Calyptaulax callirachis (Cooper 1953)
36 individuals
Trilobita - Phacopida - Encrinuridae
Cybeloides cimelia Chatterton and Ludvigsen 1976
38 individuals
Trilobita - Phacopida - Cheiruridae
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976
47 individuals
Acanthoparypha evitti Chatterton and Ludvigsen 1976
14 individuals
Sphaerexochus arenosus Chatterton and Ludvigsen 1976
8 individuals
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976
34 individuals
45 individuals
    = Holia glabra Adrain 1998
Adrain 1998
Trilobita - Odontopleurida - Odontopleuridae
Apianurus parabarbatus Chatterton and Ludvigsen 1976
20 individuals
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
10 m.y. bin: Ordovician 2-4
*Period:Middle Ordovician *Local age/stage:Chazyan
Key time interval: Chazyan
Age range of interval: 470 - 457 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Esbataottine
Local section:Section P Local bed:1512 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." 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 1512, GSC loc. no. C-26318
Database number:26054
Authorizer:S. Holland, P. Wagner, M. Hopkins Enterer:T. Hanson, P. Wagner, M. Hopkins
Modifier:M. Hopkins Research group:marine invertebrate
Created:2002-10-01 13:17:42 Last modified:2011-02-08 11:10:59
Access level:the public Released:2002-10-01 13:17:42
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]
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]