Sunblood Mountain Calyptaulax-Ceraurinella Biofacies (A-110) (Ordovician of Canada)

Also known as A 110

Where: Northwest Territories, Canada (61.6° N, 125.8° W: paleocoordinates 5.5° N, 59.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Esbataottine Formation, Chazyan (468.1 - 460.9 Ma)

• formation-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

Collection methods: Also includes ostracods.

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 25932: 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

unclassified
  -
Strophomenata
 Strophomenida - Rafinesquinidae
"? Macrocoelia sp." = Colaptomena
"? Macrocoelia sp." = Colaptomena Cooper 1956
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
Rostricellula sp. Ulrich and Cooper 1942
 Orthida - Plaesiomyidae
Chaulistomella sp. Cooper 1956
 Orthida - Glyptorthidae
Glyptorthis sp. Foerste 1914
 Orthida - Plectorthidae
Mimella sp. Cooper 1930
Trilobita
 Harpetida - Harpetidae
Dolichoharpes aff. reticulata Whittington 1949 trilobite
 Lichida - Lichidae
Hemiarges turneri4 Chatterton and Ludvigsen 1976 trilobite
Amphilichas aff. aspratilis Bradley 1930 trilobite
 Asaphida - Asaphidae
Isotelus parvirugosus Chatterton and Ludvigsen 1976 trilobite
 Asaphida - Remopleurididae
Remopleurides pattersoni Chatterton and Ludvigsen 1976 trilobite
 Corynexochida - Styginidae
Failleana calva Chatterton and Ludvigsen 1976 trilobite
 Corynexochida - Illaenidae
"Bumastus (Bumastoides) lenzi" = Bumastoides lenzi Chatterton and Ludvigsen 1976 trilobite
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976 trilobite
Nanillaenus aduncus Chatterton and Ludvigsen 1976 trilobite
 Proetida - Telephinidae
"Carrickia pinguimitra" = Phorocephala pinguimitra
"Carrickia pinguimitra" = Phorocephala pinguimitra Chatterton and Ludvigsen 1976 trilobite
 Odontopleurida - Odontopleuridae
Ceratocephala triacantheis Whittington and Evitt 1953 trilobite
Apianurus parabarbatus Chatterton and Ludvigsen 1976 trilobite
 Phacopida - Encrinuridae
Cybeloides cimelia Chatterton and Ludvigsen 1976 trilobite
Walencrinuroides rolfi3 Moss and Westrop 2014 trilobite
 Phacopida - Cheiruridae
Acanthoparypha evitti Chatterton and Ludvigsen 1976 trilobite
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976 trilobite
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976 trilobite
Ceraurinella kingstoni Chatterton and Ludvigsen 1976 trilobite
Sphaerocoryphe ludvigseni n. sp.2 Chatterton 1980 trilobite
Sphaerexochus arenosus Chatterton and Ludvigsen 1976 trilobite
Heliomeroides freschaufae2 Chatterton 1980 trilobite
Holia glabra n. sp.1 Adrain 1998 trilobite
 Phacopida - Pterygometopidae
Calyptaulax callirachis Cooper 1953 trilobite