PBDB Collection

District of Mackenzie, Esbataottine Mountain Dimeropyge Biofacies (P-1520) (Ordovician of Canada)

Also known as P 1520, GSC loc. no. C-26317

Where: Northwest Territories, Canada (61.7° N, 125.9° W: paleocoordinates 5.6° N, 59.9° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Esbataottine Formation, Chazyan (470.0 - 457.3 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." Possibly slightly deeper than the Calyptaulax-Ceraurinella fauna.

• "[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: Collection also includes rare ostracods and bryozoans.

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 26055: authorized by Steven Holland, entered by Tori Hanson on 01.10.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Trilobita
Odontopleurida - Odontopleuridae	Apianurus parabarbatus Apianurus parabarbatus Chatterton and Ludvigsen 1976 trilobite
Asaphida - Asaphidae	Nahannia mediocrisulcata, Isotelus parvirugosus Nahannia mediocrisulcata Chatterton and Ludvigsen 1976 trilobite Isotelus parvirugosus Chatterton and Ludvigsen 1976 trilobite
Asaphida - Remopleurididae	Remopleurides pattersoni Remopleurides pattersoni Chatterton and Ludvigsen 1976 trilobite
Lichida - Lichidae	Amphilichas conradi Amphilichas conradi Chatterton and Ludvigsen 1976 trilobite
Corynexochida - Styginidae	Failleana calva Failleana calva Chatterton and Ludvigsen 1976 trilobite
Corynexochida - Illaenidae	Nanillaenus aduncus, "Bumastus (Bumastoides) lenzi" = Bumastoides lenzi Nanillaenus aduncus Chatterton and Ludvigsen 1976 trilobite "Bumastus (Bumastoides) lenzi" = Bumastoides lenzi Chatterton and Ludvigsen 1976 trilobite
Phacopida - Pterygometopidae	Calyptaulax callirachis Calyptaulax callirachis Cooper 1953 trilobite
Phacopida - Encrinuridae	Cybeloides cimelia Cybeloides cimelia Chatterton and Ludvigsen 1976 trilobite
Phacopida - Cheiruridae	Sphaerexochus arenosus, Acanthoparypha echinoderma, Holia glabra¹, Ceraurinella nahanniensis Sphaerexochus arenosus Chatterton and Ludvigsen 1976 trilobite Acanthoparypha echinoderma Chatterton and Ludvigsen 1976 trilobite Holia glabra¹ Adrain 1998 trilobite Ceraurinella nahanniensis Chatterton and Ludvigsen 1976 trilobite
Proetida - Dimeropygidae	Dimeropyge speyeri² Dimeropyge speyeri² Chatterton 1994 trilobite
Proetida - Telephinidae	"Carrickia pinguimitra" = Phorocephala pinguimitra "Carrickia pinguimitra" = Phorocephala pinguimitra Chatterton and Ludvigsen 1976 trilobite
Harpetida - Harpetidae	Dolichoharpes aff. reticulata Dolichoharpes aff. reticulata Whittington 1949 trilobite

¹Adrain 1998; ²Chatterton 1994