Sunblood Mountain Calyptaulax-Ceraurinella Biofacies (A-125) (Ordovician of Canada)

Also known as A 125

Where: Northwest Territories, Canada (61.6° N, 125.7° W: paleocoordinates 5.5° N, 59.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Esbataottine Formation, Chazyan (470.0 - 457.3 Ma)

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal; argillaceous, silty limestone

• "[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."
• "[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."

Size classes: macrofossils, microfossils

Preservation: replaced with silica

Reposited in the GSC

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 25933: authorized by Steven Holland, entered by Tori Hanson on 28.09.2002, edited by Melanie Hopkins and Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Onychoplesia sp., "aechminid" indet.3
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
Rostricellula sp.
Rostricellula sp. Ulrich and Cooper 1942
 Orthida - Glyptorthidae
Glyptorthis sp.
Glyptorthis sp. Foerste 1914
 Orthida - Plaesiomyidae
Chaulistomella sp.
Chaulistomella sp. Cooper 1956
 Orthida - Plectorthidae
Mimella sp.
Mimella sp. Cooper 1930
Strophomenata
 Strophomenida - Rafinesquinidae
"? Macrocoelia sp." = Colaptomena
"? Macrocoelia sp." = Colaptomena Cooper 1956
Trilobita
 Proetida - Telephinidae
"Carrickia pinguimitra" = Phorocephala pinguimitra
"Carrickia pinguimitra" = Phorocephala pinguimitra Chatterton and Ludvigsen 1976 trilobite
 Corynexochida - Illaenidae
"Bumastus (Bumastoides) lenzi" = Bumastoides lenzi, Nanillaenus aduncus, Nanillaenus mackenziensis
"Bumastus (Bumastoides) lenzi" = Bumastoides lenzi Chatterton and Ludvigsen 1976 trilobite
Nanillaenus aduncus Chatterton and Ludvigsen 1976 trilobite
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976 trilobite
 Corynexochida - Styginidae
Failleana calva
Failleana calva Chatterton and Ludvigsen 1976 trilobite
 Odontopleurida - Odontopleuridae
Ceratocephala triacantheis, Apianurus parabarbatus
Ceratocephala triacantheis Whittington and Evitt 1953 trilobite
Apianurus parabarbatus Chatterton and Ludvigsen 1976 trilobite
 Lichida - Lichidae
Hemiarges turneri, Amphilichas aff. aspratilis
Hemiarges turneri Chatterton and Ludvigsen 1976 trilobite
Amphilichas aff. aspratilis Bradley 1930 trilobite
 Harpetida - Harpetidae
Dolichoharpes aff. reticulata
Dolichoharpes aff. reticulata Whittington 1949 trilobite
 Asaphida - Remopleurididae
Remopleurides pattersoni
Remopleurides pattersoni Chatterton and Ludvigsen 1976 trilobite
 Asaphida - Asaphidae
Isotelus parvirugosus
Isotelus parvirugosus Chatterton and Ludvigsen 1976 trilobite
 Phacopida - Pterygometopidae
Calyptaulax callirachis
Calyptaulax callirachis Cooper 1953 trilobite
 Phacopida - Cheiruridae
Sphaerocoryphe ludvigseni2, Holia glabra1, Pandaspinapyga dactyla, Acanthoparypha echinoderma, Acanthoparypha evitti, Heliomeroides freschaufae2, Ceraurinella kingstoni, Ceraurinella nahanniensis, Sphaerexochus arenosus
Sphaerocoryphe ludvigseni2 Chatterton 1980 trilobite
Holia glabra1 Adrain 1998 trilobite
Pandaspinapyga dactyla Chatterton and Ludvigsen 1976 trilobite
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976 trilobite
Acanthoparypha evitti Chatterton and Ludvigsen 1976 trilobite
Heliomeroides freschaufae2 Chatterton 1980 trilobite
Ceraurinella kingstoni Chatterton and Ludvigsen 1976 trilobite
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976 trilobite
Sphaerexochus arenosus Chatterton and Ludvigsen 1976 trilobite
 Phacopida - Encrinuridae
Cybeloides cimelia, Walencrinuroides rolfi4
Cybeloides cimelia Chatterton and Ludvigsen 1976 trilobite
Walencrinuroides rolfi4 Moss and Westrop 2014 trilobite
Ostracoda
 Leperditellocopida - Schmidtellidae
Schmidtella affinis3
 Leperditellocopida - Aparchitidae
"Aparchites" fimbriatus3
 Hollinocopida - Tetradellidae
Tetradella perplexa n. sp.3
Tetradella perplexa n. sp.3 ostracod
 Hollinocopida - Euprimitiidae
? Euprimitia krafti n. sp.3
? Euprimitia krafti n. sp.3 ostracod
 Hollinocopida - Eurychilinidae
Eurychilina sunbloodensis n. sp.3
Eurychilina sunbloodensis n. sp.3 ostracod
 Palaeocopida - Cryptophyllidae
Cryptophyllus oboloides3
 Palaeocopida - Leperditellidae
Leperditella sp.3
 Palaeocopida - Lomatopisthiidae
Bolbopisthia ludvigseni n. sp.3
Bolbopisthia ludvigseni n. sp.3 ostracod
 Podocopida - Bairdiidae
Krausella ? minuta3
 Podocopida - Bairdiocyprididae
Bairdiocypris cf. granti3
 Podocopida - Steusloffinidae
Steusloffina borealis n. sp.3
Steusloffina borealis n. sp.3 ostracod
1Adrain 1998; 2Chatterton 1980; 3Copeland 1974; 4Moss and Westrop 2014