Sunblood Mountain Calyptaulax-Ceraurinella Biofacies (A-110): Chazyan, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Onychoplesia sp.
Rhynchonellata - Orthida - Plectorthidae
Mimella sp. Cooper 1930
Rhynchonellata - Orthida - Plaesiomyidae
Chaulistomella sp. Cooper 1956
Rhynchonellata - Orthida - Glyptorthidae
Glyptorthis sp. Foerste 1914
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Rostricellula sp. Ulrich and Cooper 1942
Strophomenata - Strophomenida - Rafinesquinidae
? Macrocoelia sp.
synonym of Colaptomena
Trilobita - Odontopleurida - Odontopleuridae
Ceratocephala triacantheis Whittington and Evitt 1953
38 individuals
Apianurus parabarbatus Chatterton and Ludvigsen 1976
15 individuals
Trilobita - Asaphida - Asaphidae
Isotelus parvirugosus Chatterton and Ludvigsen 1976
30 individuals
Trilobita - Asaphida - Remopleurididae
Remopleurides pattersoni Chatterton and Ludvigsen 1976
78 individuals
Trilobita - Lichida - Lichidae
Hemiarges turneri Chatterton and Ludvigsen 1976
19 individuals
    = Hemiarges turneri Chatterton and Ludvigsen 1976
Rudkin et al. 1994
subspecies turneri
Amphilichas aff. aspratilis (Bradley 1930)
3 individuals
Trilobita - Corynexochida - Styginidae
20 individuals
Trilobita - Corynexochida - Illaenidae
Nanillaenus aduncus Chatterton and Ludvigsen 1976
7 individuals
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976
130 individuals
Bumastus (Bumastoides) lenzi Chatterton and Ludvigsen 1976
17 individuals
recombined as Bumastoides lenzi
Trilobita - Phacopida - Pterygometopidae
Calyptaulax callirachis (Cooper 1953)
266 individuals
Trilobita - Phacopida - Encrinuridae
Cybeloides cimelia Chatterton and Ludvigsen 1976
80 individuals
Encrinuroides rarus (Walcott 1877)
5 individuals
    = Walencrinuroides rolfi Moss and Westrop 2014
Moss and Westrop 2014
Trilobita - Phacopida - Cheiruridae
Sphaerocoryphe ludvigseni n. sp. Chatterton 1980
Chatterton 1980
Sphaerexochus arenosus Chatterton and Ludvigsen 1976
36 individuals
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976
1 individual
Acanthoparypha evitti Chatterton and Ludvigsen 1976
11 individuals
6 individuals
    = Holia glabra n. sp. Adrain 1998
Adrain 1998
Heliomeroides teres Evitt 1951
1 individual
    = Heliomeroides freschaufae Chatterton 1980
Chatterton 1980
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976
134 individuals
Ceraurinella kingstoni Chatterton and Ludvigsen 1976
3 individuals
Trilobita - Proetida - Telephinidae
Carrickia pinguimitra Chatterton and Ludvigsen 1976
16 individuals
recombined as Phorocephala pinguimitra
Trilobita - Harpetida - Harpetidae
Dolichoharpes aff. reticulata Whittington 1949
29 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:estimated from map
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:470.00000 - 457.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Esbataottine
Local section:Section A Local bed:110 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:replaced with silica
Size of fossils:macrofossils,microfossils
Collection methods and comments
Collection excludes:all microfossils
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Collection method comments: Also includes ostracods.
Metadata
Also known as:A 110
Database number:25932
Authorizer:S. Holland, P. Wagner, M. Hopkins Enterer:T. Hanson, M. Hopkins, P. Wagner
Modifier:M. Hopkins Research group:marine invertebrate
Created:2002-09-28 18:56:08 Last modified:2011-01-12 14:49:35
Access level:the public Released:2002-09-28 18:56:08
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]
35465 B. D. E. Chatterton. 1980. Ontogenetic studies of Middle Ordovician trilobites from the Esbataottine Formation, Mackenzie Mountains, Canada. Palaeontographica Abteilung A 171:1-74 [M. Hopkins/M. Hopkins]
53464 D. K. Moss and S. R. Westrop. 2014. Systematics of some Late Ordovician encrinurine trilobites from Laurentian North America. Journal of Paleontology 88(6):1095-1119 [P. Wagner/P. Wagner]
63309 D. M. Rudkin, R. P. Tripp, and R. Ludvigsen. 1994. The Ordovician trilobite genus Hemiarges (Lichidae: Trochurinae) from North American and Greenland. New York State Museum Bulletin 481:289-306 [M. Hopkins/M. Hopkins]