PBDB Collection

District of Mackenzie, Esbataottine Mountain (P-1485) (Ordovician of Canada)

Also known as P 1485, GSC loc. no. C-26320

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)

• 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 class: macrofossils

Preservation: replaced with silica

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 26057: authorized by Steven Holland, entered by Tori Hanson on 01.10.2002, edited by Melanie Hopkins and Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

unclassified
-	Faillaena calva, Nahanni mediocrisulcata Faillaena calva Nahanni mediocrisulcata
Trilobita
Asaphida - Remopleurididae	Remopleurides pattersoni Remopleurides pattersoni Chatterton and Ludvigsen 1976 trilobite
Lichida - Lichidae	Amphilichas aff. aspratilis, Amphilichas conradi, Hemiarges turneri Amphilichas aff. aspratilis Bradley 1930 trilobite Amphilichas conradi Chatterton and Ludvigsen 1976 trilobite Hemiarges turneri Chatterton and Ludvigsen 1976 trilobite
Proetida - Dimeropygidae	Dimeropyge speyeri³ Dimeropyge speyeri³ 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
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	Walencrinuroides rolfi⁵, Cybeloides cimelia Walencrinuroides rolfi⁵ Moss and Westrop 2014 trilobite Cybeloides cimelia Chatterton and Ludvigsen 1976 trilobite
Phacopida - Cheiruridae	Heliomeroides freschaufae², Heliomeroides teres, Acanthoparypha evitti, Pandaspinapyga dactyla, Sphaerexochus arenosus, Holia glabra¹, Ceraurinella nahanniensis, Ceraurinella kingstoni Heliomeroides freschaufae² Chatterton 1980 trilobite cranidium formerly identified as Heliomeroides teres Heliomeroides teres Evitt 1951 trilobite Acanthoparypha evitti Chatterton and Ludvigsen 1976 trilobite Pandaspinapyga dactyla Chatterton and Ludvigsen 1976 trilobite Sphaerexochus arenosus Chatterton and Ludvigsen 1976 trilobite Holia glabra¹ Adrain 1998 trilobite Ceraurinella nahanniensis Chatterton and Ludvigsen 1976 trilobite Ceraurinella kingstoni 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
Ostracoda
-	Ludvigsenites mackenziensis n. sp.⁴ Ludvigsenites mackenziensis n. sp.⁴ ostracod
Hollinocopida - Eurychilinidae	Eurychilina sunbloodensis⁴ Eurychilina sunbloodensis⁴ ostracod
Leperditellocopida - Aparchitidae	"Aparchites" cf. fimbriatus⁴, "Aparchites" sp.⁴ "Aparchites" cf. fimbriatus⁴ ostracod "Aparchites" sp.⁴ ostracod
Podocopida - Bairdiocyprididae	Bairdiocypris cf. granti⁴ Bairdiocypris cf. granti⁴ ostracod
Podocopida - Bairdiidae	Krausella ? minuta⁴ Krausella ? minuta⁴ ostracod
Palaeocopida - Lomatopisthiidae	Bolbopisthia ludvigseni⁴ Bolbopisthia ludvigseni⁴ ostracod

¹Adrain 1998; ²Chatterton 1980; ³Chatterton 1994; ⁴Copeland 1974; ⁵Moss and Westrop 2014