Mackenzie Mountains, Whittaker Range, Esbataottine Formation Mimella Fauna (Ordovician to of Canada)

Where: Northwest Territories, Canada (62.5° N, 124.8° W: paleocoordinates 6.3° N, 57.9° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Pygodus anserinus-Amorphognathus tvaerensis conodont zone, Esbataottine Formation, Chazyan to Chazyan (470.0 - 449.5 Ma)

• formation-level stratigraphic resolution

Environment/lithology: gray, argillaceous, silty limestone

• Environmental call by T. Hanson.
• "[M]edium to dark grey, microcrystalline to finely crystalline, thin to medium bedded, commonly argillaceous and silty limestones that weathers banded grey and buff."

Size class: macrofossils

Primary reference: R. Ludvigsen. 1975. Ordovician formations and faunas, southern Mackenzie Mountains. Canadian Journal of Earth Sciences 12:663-697 [S. Holland/T. Hanson/J. Ju]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 25310: authorized by Steven Holland, entered by Tori Hanson on 08.09.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Aplanurus barbatus, Onychoplesia sp.
Rhynchonellata
 Orthida - Plaesiomyidae
Chaulistomella cf. nitens
 Orthida - Plectorthidae
Mimella aff. globosa
Mimella aff. globosa Willard 1928
Ostracoda
 Hollinocopida - Tetradellidae
Tetradella sp.
Tetradella sp. Ulrich 1890 ostracod
Trilobita
 Proetida - Dimeropygidae
Dimeropyge speyeri2
Dimeropyge speyeri2 Chatterton 1994 trilobite
 Proetida - Telephinidae
"Carrickia sp." = Phorocephala
"Carrickia sp." = Phorocephala Lu 1965 trilobite
 Phacopida - Pterygometopidae
Calyptaulax sp.
Calyptaulax sp. Cooper 1930 trilobite
 Phacopida - Encrinuridae
Walencrinuroides rolfi3, Cybeloides cf. prima
Walencrinuroides rolfi3 Moss and Westrop 2014 trilobite
Cybeloides cf. prima Narraway and Raymond 1906 trilobite
 Phacopida - Cheiruridae
Ceraurinella spp., Acanthoparypha sp., Pandaspinapyga sp., Holia glabra1, Heliomeroides teres, Sphaerexochus sp.
Ceraurinella spp. Cooper 1953 trilobite
Acanthoparypha sp. Whittington and Evitt 1953 trilobite
Pandaspinapyga sp. Esker and Levin 1964 trilobite
Holia glabra1 Adrain 1998 trilobite
Heliomeroides teres Evitt 1951 trilobite
Sphaerexochus sp. Beyrich 1845 trilobite
 Harpetida - Harpetidae
Dolichoharpes reticulata
Dolichoharpes reticulata Whittington 1949 trilobite
 Asaphida - Asaphidae
Nileoides sp.
Nileoides sp. Raymond 1920 trilobite
 Asaphida - Remopleurididae
Remopleurides cf. canadensis
Remopleurides cf. canadensis Billings 1865 trilobite
 Lichida - Lichidae
Amphilichas sp.
Amphilichas sp. Raymond 1905 trilobite
 Odontopleurida - Odontopleuridae
Ceratocephala cf. triacantheis
Ceratocephala cf. triacantheis Whittington and Evitt 1953 trilobite
misspelled as 'tricantheis' in reference
1Adrain 1998; 2Chatterton 1994; 3Moss and Westrop 2014