District of Mackenzie, Esbataottine Mountain Isotelus Biofacies (P-1585): Blackriveran, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Strophomenata - Strophomenida - Strophomenidae
Strophomena sp. Rafinesque and De Blainville 1824
Ostracoda - Palaeocopida - Leperditellidae
Leperditella mundula
Copeland 1974
Ostracoda - Palaeocopida - Oepikellidae
Oepikella cf. labrosa
Copeland 1974
Trilobita - Corynexochida - Illaenidae
Nanillaenus sp. Jaanusson 1954
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976
7 individuals
Bumastoides sp. (Whittington 1954)
Trilobita - Asaphida - Asaphidae
Isotelus sp. Dekay 1824
Isotelus parvirugosus Chatterton and Ludvigsen 1976
1 individual
Nahannia sp. Chatterton and Ludvigsen 1976
Nahannia humilisulcata Chatterton and Ludvigsen 1976
272 individuals
Trilobita - Phacopida - Cheiruridae
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976
see common names

Geography
Country:Canada State/province:Northwest Territories County:District of Mackenzie
Coordinates: 61.7° North, 125.9° West (view map)
Paleocoordinates:7.0° North, 58.0° West
Basis of coordinate:stated in text
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 P Local bed:1585 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."
Taphonomy
Modes of preservation:body
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 leperditellid and oepikellid ostracods and bryozoans.
Metadata
Also known as:P 1585, GSC loc. no. C-26314
Database number:25931
Authorizer:S. Holland, M. Hopkins Enterer:T. Hanson, M. Hopkins
Modifier:M. Hopkins Research group:marine invertebrate
Created:2002-09-28 18:42:13 Last modified:2011-01-12 15:11:43
Access level:the public Released:2002-09-28 18:42:13
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]