District of Mackenzie Bathyurus ulu zone (Ordovician of Canada)

Where: Northwest Territories, Canada (61.7° N, 125.9° W: paleocoordinates 7.0° N, 58.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Bathyurus ulu trilobite zone, Esbataottine Formation, Blackriveran (457.3 - 449.6 Ma)

• formation-level stratigraphic resolution

Environment/lithology: gray, argillaceous, silty limestone

• Environmental and Tectonic Setting calls by S.M. Holland
• ...medium to dark grey, microcrystalline to finely crystalline, thin- to medium-bedded, commonly argillaceous and silty limestones that weather banded grey and buff.

Size class: macrofossils

Preservation: replaced with silica

Collection methods: bulk, chemical,

Primary reference: R. Ludvigsen. 1979. A trilobite zonation of Middle Ordovician rocks, southwestern District of Mackenzie. Geological Survey of Canada Bulletin 312:1-98 [S. Holland/S. Holland/J. Ju]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 24628: authorized by Steven Holland, entered by Steven Holland on 12.08.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Pachydicta sp.
Ostracoda
  - Sigmoopsidae
Oecematobolbina varicata
 Hollinocopida - Oepikellidae
Oepikella labrosa
 Hollinocopida - Eurychilinidae
Eurychilina sunbloodensis
 Leperditellocopida - Schmidtellidae
Schmidtella affinis
 Palaeocopida - Lomatopisthiidae
Bolbopisthia ludvigseni
 Palaeocopida - Leperditellidae
Leperditella mundula
 Podocopida - Bairdiocyprididae
Bairdiocypris sp.
Bairdiocypris sp. Kegel 1932 ostracod
 Podocopida - Bairdiidae
Krausella ? minuta
Trilobita
 Phacopida - Encrinuridae
Cybeloides cimelia, Walencrinuroides rolfi
Cybeloides cimelia Chatterton and Ludvigsen 1976 trilobite
Walencrinuroides rolfi Moss and Westrop 2014 trilobite
 Phacopida - Cheiruridae
Ceraurinella seriata n. sp., Sphaerexochus arenosus
Ceraurinella seriata n. sp. Ludvigsen 1979 trilobite
Sphaerexochus arenosus Chatterton and Ludvigsen 1976 trilobite
 Phacopida - Pterygometopidae
Calyptaulax cf. strasburgensis
 Proetida - Bathyuridae
Bathyurus ulu n. sp., Bathyurus platyparius n. sp.
Bathyurus ulu n. sp. Ludvigsen 1979 trilobite
Bathyurus platyparius n. sp. Ludvigsen 1979 trilobite
 Asaphida - Asaphidae
Isotelus parvirugosus, Nahannia mediocrisulcata
Isotelus parvirugosus Chatterton and Ludvigsen 1976 trilobite
Nahannia mediocrisulcata Chatterton and Ludvigsen 1976 trilobite
 Asaphida - Remopleurididae
Remopleurides pattersoni
Remopleurides pattersoni Chatterton and Ludvigsen 1976 trilobite
 Lichida - Lichidae
Amphilichas sp.
Amphilichas sp. Raymond 1905 trilobite
 Harpetida - Harpetidae
Dolichoharpes aff. reticulata
Dolichoharpes aff. reticulata Whittington 1949 trilobite
 Corynexochida - Illaenidae
Nanillaenus mackenziensis
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976 trilobite
 Odontopleurida - Odontopleuridae
Apianurus parabarbatus n. sp.
Apianurus parabarbatus n. sp. Chatterton and Ludvigsen 1976 trilobite
Rhynchonellata
 Orthida - Plectorthidae
Mimella aff. globosa
Mimella aff. globosa Willard 1928
Strophomenata
 Strophomenida - Strophomenidae
Strophomena inspeciosa
Stenolaemata
 Cryptostomata - Ptilodictyidae
? Stictoporella sp., Ptilodictya sp.
? Stictoporella sp. Ulrich 1882
Ptilodictya sp. Lonsdale 1839
 Cryptostomata - Rhinidictyidae
Stictopora sp.
Stictopora sp. Hall 1847
 Cryptostomata - Arthrostylidae
Ulrichostylus sp., Helopora sp.
Ulrichostylus sp. Bassler 1952
Helopora sp. Hall 1851
 Trepostomata - Heterotrypidae
Dekayia sp.
Dekayia sp. Milne-Edwards and Haime 1851