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
Remopleurides pattersoni Chatterton and Ludvigsen 1976
9 individuals
Trilobita - Asaphida - Asaphidae
Isotelus parvirugosus Chatterton and Ludvigsen 1976
12 individuals
Nahannia mediocrisulcata Chatterton and Ludvigsen 1976
2 individuals
Trilobita - Phacopida - Pterygometopidae
Calyptaulax callirachis (Cooper 1953)
67 individuals
Trilobita - Phacopida - Cheiruridae
4 individuals
    = Holia glabra Adrain 1998
Adrain 1998
Sphaerexochus arenosus Chatterton and Ludvigsen 1976
1 individual
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976
2 individuals
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976
10 individuals
Trilobita - Phacopida - Encrinuridae
Cybeloides cimelia Chatterton and Ludvigsen 1976
6 individuals
Trilobita - Corynexochida - Illaenidae
Nanillaenus aduncus Chatterton and Ludvigsen 1976
2 individuals
Bumastus (Bumastoides) lenzi Chatterton and Ludvigsen 1976
11 individuals
recombined as Bumastoides lenzi
Trilobita - Corynexochida - Styginidae
1 individual
Trilobita - Odontopleurida - Odontopleuridae
Apianurus parabarbatus Chatterton and Ludvigsen 1976
3 individuals
Trilobita - Proetida - Telephinidae
Carrickia pinguimitra Chatterton and Ludvigsen 1976
8 individuals
recombined as Phorocephala pinguimitra
Trilobita - Proetida - Dimeropygidae
Dimeropyge clintonensis Shaw 1968
124 individuals
    = Dimeropyge speyeri Chatterton 1994
Chatterton 1994
Trilobita - Harpetida - Harpetidae
Dolichoharpes aff. reticulata Whittington 1949
3 individuals
Trilobita - Lichida - Lichidae
Amphilichas conradi Chatterton and Ludvigsen 1976
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]