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 - Podocopida - Bairdiocyprididae
Bairdiocypris cf. granti
Copeland 1974
Ostracoda - Leperditellocopida - Aparchitidae
"Aparchites" sp.
Copeland 1974
Trilobita - Harpetida - Harpetidae
Dolichoharpes aff. reticulata Whittington 1949
60 individuals
Trilobita - Lichida - Lichidae
Amphilichas conradi Chatterton and Ludvigsen 1976
4 individuals
Trilobita - Asaphida - Asaphidae
Nahannia mediocrisulcata Chatterton and Ludvigsen 1976
2 individuals
Isotelus parvirugosus Chatterton and Ludvigsen 1976
17 individuals
Trilobita - Asaphida - Remopleurididae
Remopleurides pattersoni Chatterton and Ludvigsen 1976
13 individuals
Trilobita - Corynexochida - Styginidae
3 individuals
Trilobita - Corynexochida - Illaenidae
Bumastus (Bumastoides) lenzi Chatterton and Ludvigsen 1976
31 individuals
recombined as Bumastoides lenzi
Nanillaenus aduncus Chatterton and Ludvigsen 1976
8 individuals
Trilobita - Proetida - Dimeropygidae
Dimeropyge clintonensis Shaw 1968
277 individuals
    = Dimeropyge speyeri Chatterton 1994
Chatterton 1994
Trilobita - Proetida - Telephinidae
Carrickia pinguimitra Chatterton and Ludvigsen 1976
6 individuals
recombined as Phorocephala pinguimitra
Trilobita - Odontopleurida - Odontopleuridae
Apianurus parabarbatus Chatterton and Ludvigsen 1976
20 individuals
Trilobita - Phacopida - Encrinuridae
Cybeloides cimelia Chatterton and Ludvigsen 1976
38 individuals
Trilobita - Phacopida - Cheiruridae
Acanthoparypha evitti Chatterton and Ludvigsen 1976
14 individuals
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976
47 individuals
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976
34 individuals
Sphaerexochus arenosus Chatterton and Ludvigsen 1976
8 individuals
45 individuals
    = Holia glabra Adrain 1998
Adrain 1998
Trilobita - Phacopida - Pterygometopidae
Calyptaulax callirachis (Cooper 1953)
36 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 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: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]