District of Mackenzie, Sunblood Mountain (A-160): Chazyan, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita - Corynexochida - Styginidae
1 individual
Trilobita - Corynexochida - Illaenidae
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976
25 individuals
Bumastus (Bumastoides) lenzi Chatterton and Ludvigsen 1976
1 individual
Trilobita - Asaphida - Remopleurididae
Remopleurides pattersoni Chatterton and Ludvigsen 1976
11 individuals
Trilobita - Asaphida - Asaphidae
Isotelus parvirugosus Chatterton and Ludvigsen 1976
6 individuals
Trilobita - Phacopida - Pterygometopidae
Calyptaulax callirachis (Cooper 1953)
24 individuals
Trilobita - Phacopida - Cheiruridae
Ceraurinella kingstoni Chatterton and Ludvigsen 1976
3 individuals
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976
28 individuals
see common names

Geography
Country:Canada State/province:Northwest Territories County:District of Mackenzie
Coordinates: 61.6° North, 125.8° West (view map)
Paleocoordinates:5.5° 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 A Local bed:160 cm
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:replaced with silica
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Metadata
Also known as:A 160
Database number:26056
Authorizer:S. Holland Enterer:T. Hanson
Modifier:M. Hopkins Research group:marine invertebrate
Created:2002-10-01 13:42:23 Last modified:2011-01-12 14:51:17
Access level:the public Released:2002-10-01 13:42:23
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]