Sunblood Mountain Calyptaulax-Ceraurinella Biofacies (A-125): Chazyan, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Onychoplesia sp.
informal aechminid indet.
Copeland 1974
Strophomenata - Strophomenida - Rafinesquinidae
? Macrocoelia sp.
synonym of Colaptomena
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Rostricellula sp. Ulrich and Cooper 1942
Rhynchonellata - Orthida - Plaesiomyidae
Chaulistomella sp. Cooper 1956
Rhynchonellata - Orthida - Glyptorthidae
Glyptorthis sp. Foerste 1914
Rhynchonellata - Orthida - Plectorthidae
Mimella sp. Cooper 1930
Ostracoda - Hollinocopida - Euprimitiidae
? Euprimitia krafti n. sp.
Copeland 1974
Ostracoda - Hollinocopida - Tetradellidae
Tetradella perplexa n. sp.
Copeland 1974
Ostracoda - Hollinocopida - Eurychilinidae
Eurychilina sunbloodensis n. sp.
Copeland 1974
Ostracoda - Leperditellocopida - Aparchitidae
"Aparchites" fimbriatus
Copeland 1974
Ostracoda - Leperditellocopida - Schmidtellidae
Schmidtella affinis
Copeland 1974
Ostracoda - Podocopida - Steusloffinidae
Steusloffina borealis n. sp.
Copeland 1974
Ostracoda - Podocopida - Bairdiidae
Krausella ? minuta
Copeland 1974
Ostracoda - Podocopida - Bairdiocyprididae
Bairdiocypris cf. granti
Copeland 1974
Ostracoda - Palaeocopida - Lomatopisthiidae
Bolbopisthia ludvigseni n. sp.
Copeland 1974
Ostracoda - Palaeocopida - Leperditellidae
Leperditella sp.
Copeland 1974
Ostracoda - Palaeocopida - Cryptophyllidae
Cryptophyllus oboloides
Copeland 1974
Trilobita - Corynexochida - Styginidae
13 individuals
Trilobita - Corynexochida - Illaenidae
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976
6 individuals
Nanillaenus aduncus Chatterton and Ludvigsen 1976
13 individuals
Bumastus (Bumastoides) lenzi Chatterton and Ludvigsen 1976
11 individuals
recombined as Bumastoides lenzi
Trilobita - Proetida - Telephinidae
Carrickia pinguimitra Chatterton and Ludvigsen 1976
32 individuals
recombined as Phorocephala pinguimitra
Trilobita - Phacopida - Pterygometopidae
Calyptaulax callirachis (Cooper 1953)
188 individuals
Trilobita - Phacopida - Encrinuridae
Encrinuroides rarus (Walcott 1877)
39 individuals
    = Walencrinuroides rolfi Moss and Westrop 2014
Moss and Westrop 2014
Cybeloides cimelia Chatterton and Ludvigsen 1976
70 individuals
Trilobita - Phacopida - Cheiruridae
Ceraurinella kingstoni Chatterton and Ludvigsen 1976
19 individuals
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976
155 individuals
Acanthoparypha evitti Chatterton and Ludvigsen 1976
15 individuals
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976
2 individuals
Pandaspinapyga dactyla Chatterton and Ludvigsen 1976
1 individual
2 individuals
    = Holia glabra Adrain 1998
Adrain 1998
Sphaerocoryphe cf. pemphis
1 individual
    = Sphaerocoryphe ludvigseni Chatterton 1980
Chatterton 1980
Heliomeroides freschaufae Chatterton 1980
Chatterton 1980
Sphaerexochus arenosus Chatterton and Ludvigsen 1976
117 individuals
Trilobita - Harpetida - Harpetidae
Dolichoharpes aff. reticulata Whittington 1949
45 individuals
Trilobita - Asaphida - Asaphidae
Isotelus parvirugosus Chatterton and Ludvigsen 1976
35 individuals
Trilobita - Asaphida - Remopleurididae
Remopleurides pattersoni Chatterton and Ludvigsen 1976
74 individuals
Trilobita - Lichida - Lichidae
Amphilichas aff. aspratilis (Bradley 1930)
4 individuals
Hemiarges turneri Chatterton and Ludvigsen 1976
29 individuals
Trilobita - Odontopleurida - Odontopleuridae
Ceratocephala triacantheis Whittington and Evitt 1953
42 individuals
Apianurus parabarbatus Chatterton and Ludvigsen 1976
7 individuals
see common names

Geography
Country:Canada State/province:Northwest Territories County:District of Mackenzie
Coordinates: 61.6° North, 125.7° 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:125 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."
Taphonomy
Modes of preservation:body,replaced with silica
Size of fossils:macrofossils,microfossils
Collection methods and comments
Collection excludes:all microfossils,species names
Collection methods:field collection
Reason for describing collection:biostratigraphic analysis
Museum repositories:GSC
Metadata
Also known as:A 125
Database number:25933
Authorizer:S. Holland, M. Hopkins, P. Wagner Enterer:T. Hanson, P. Wagner, M. Hopkins
Modifier:M. Hopkins Research group:marine invertebrate
Created:2002-09-28 19:14:16 Last modified:2011-02-08 11:09:57
Access level:the public Released:2002-09-28 19:14:16
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]
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]
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]