District of Mackenzie Whittakerites planatus zone (Ordovician to of Canada)

Where: Northwest Territories, Canada (62.0° N, 127.0° W: paleocoordinates 7.5° N, 57.8° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Whittakerites planatus trilobite zone, Whittaker Formation, Shermanian to Shermanian (457.3 - 450.2 Ma)

• Lower Whittaker

Environment/lithology: deep subtidal; lithified, gray, argillaceous limestone

• Environmental and Tectonic Setting calls by S.M. Holland
• thinly bedded, dark grey and argillaceous limestones

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 24637: authorized by Steven Holland, entered by Steven Holland on 12.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Calymenida indet., Cheirurinida indet., Nematoporida indet., Phylloporinida indet.
Stenolaemata
 Trepostomata -
Trepostomata indet.
Trepostomata indet. Ulrich 1882
 Cryptostomata - Arthrostylidae
Sceptropora sp.
Sceptropora sp. Ulrich 1888
Rhynchonellata
 Orthida - Hesperorthidae
Hesperorthis sp.
Hesperorthis sp. Schuchert and Cooper 1931
Strophomenata
 Strophomenida - Furcitellidae
Megamyonia sp.
Megamyonia sp. Wang 1949
 Strophomenida - Rafinesquinidae
Rafinesquina cf. sardesoni
 Strophomenida - Strophomenidae
Strophomena vetusta, Strophomena planumbona, Tetraphalerella sp., ? Tetraphalerella neglecta
 Strophomenida - Sowerbyellidae
Sowerbyella sp.
Sowerbyella sp. Jones 1928
Trilobita
 Lichida -
Lichida indet.
Lichida indet. Moore 1959 trilobite
 Harpetida - Harpetidae
Dolichoharpes sp.
Dolichoharpes sp. Whittington 1949 trilobite
 Phacopida - Encrinuridae
Cybeloides sp.
Cybeloides sp. Slocum 1913 trilobite
 Phacopida - Cheiruridae
Ceraurinus serratus n. sp., Ceraurinella brevispina n. sp., Borealaspis biformis, Whittakerites planatus, "Sphaerocoryphe robustus" = Sphaerocoryphe robusta, Ceraurus milleranus, Ceraurus maewestoides n. sp.
Ceraurinus serratus n. sp. trilobite
Ceraurinella brevispina n. sp. Ludvigsen 1979 trilobite
Borealaspis biformis Ludvigsen 1976 trilobite
Whittakerites planatus Ludvigsen 1976 trilobite
"Sphaerocoryphe robustus" = Sphaerocoryphe robusta Walcott 1875 trilobite
Ceraurus milleranus Miller and Gurley 1897 trilobite
Ceraurus maewestoides n. sp. Ludvigsen 1979 trilobite
 Proetida - Otarionidae
Otarion sp.
Otarion sp. Zenker 1833 trilobite
 Proetida - Proetidae
Cyphoproetus sp.
Cyphoproetus sp. Kegel 1927 trilobite
 Corynexochida - Illaenidae
Bumastoides sp.
Bumastoides sp. Whittington 1954 trilobite
Ostracoda
 Podocopida - Bairdiocyprididae
Bairdiocypris cf. cylindrica
 Podocopida - Bairdiidae
Krausella inaequalis, ? Krausella cf. acuta
 Palaeocopida - Leperditellidae
Leperditella sp.