District of Mackenzie Ceraurus mackenziensis zone (Ordovician of Canada)

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

• Paleocoordinates: 17.4° N, 111.1° W (Wright 2013)

• coordinate estimated from map

• basin-level geographic resolution

When: Ceraurus mackenziensis trilobite zone, Whittaker Formation, Edenian (451.0 - 450.2 Ma)

• Originally given as Kirkfieldian to Shermanian. Was given as Ceraurus mackenziensis member.

• formation-level stratigraphic resolution

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 24636: authorized by Steven Holland, entered by Steven Holland on 12.08.2002, edited by Pete Wagner

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Nematoporida indet.
Rhynchonellata
 Orthida - Plaesiomyidae
? Plaesiomys sp.
? Plaesiomys sp. Hall and Clarke 1892
 Orthida - Hesperorthidae
Hesperorthis sp.
Hesperorthis sp. Schuchert and Cooper 1931
 Orthida - Glyptorthidae
Glyptorthis sp.
Glyptorthis sp. Foerste 1914
 Orthida - Orthidae
Boreadorthis sp.
Boreadorthis sp. Opik 1934
 Orthida - Platystrophiidae
Platystrophia sp.
 Orthida - Dalmanellidae
? Paucicrura sp.
? Paucicrura sp. Cooper 1956
 Atrypida - Anazygidae
Zygospira sp., Zygospira sulcata, Zygospira modesta
Zygospira sp. Hall 1862
Zygospira sulcata Howe 1965
Zygospira modesta Hall 1847
 Rhynchonellida - Ancistrorhynchidae
Ancistrorhyncha sp.
Ancistrorhyncha sp. Ulrich and Cooper 1942 rhynchonellid brachiopod
 Rhynchonellida - Rhynchotrematidae
Rhynchotrema sp., "Lepidocyclus perlamellosus" = Lepidocyclus perlamellosa
Rhynchotrema sp. Hall 1860 rhynchonellid brachiopod
"Lepidocyclus perlamellosus" = Lepidocyclus perlamellosa Whitfield 1878 rhynchonellid brachiopod
Strophomenata
 Strophomenida - Furcitellidae
Oepikina aff. pergibbosa, Megamyonia cf. unicostata
Megamyonia cf. unicostata Meek and Worthen 1868
 Strophomenida - Strophomenidae
Holtedahlina sulcata, Tetraphalerella sp., "Tetraphalerella cooperi" = Strophomena (Tetraphalerella) cooperi, Strophomena sp., Strophomena planumbona, "Strophomena fluctuosa" = Nasutimena fluctuosa
Holtedahlina sulcata Hall and Clarke 1892
"Tetraphalerella cooperi" = Strophomena (Tetraphalerella) cooperi Wang 1949
Strophomena sp. Rafinesque and De Blainville 1824
"Strophomena fluctuosa" = Nasutimena fluctuosa Billings 1860
 Strophomenida - Rafinesquinidae
Rafinesquina cf. sardesoni
 Strophomenida - Sowerbyellidae
Thaerodonta recedens, Sowerbyella sp.
Thaerodonta recedens Sardeson 1892
Sowerbyella (Thaerodonta) recedens
Sowerbyella sp. Jones 1928
Stenolaemata
 Cryptostomata - Ptilodictyidae
Ptilodictya sp.
Ptilodictya sp. Lonsdale 1839
 Cryptostomata - Escharoporidae
Escharopora sp.
Escharopora sp. Hall 1847
 Cryptostomata - Rhinidictyidae
Stictopora sp.
Stictopora sp. Hall 1847
Artiopoda
 Corynexochida - Illaenidae
Bumastoides sp.
Bumastoides sp. Whittington 1954 trilobite
 Lichida - Lichidae
Hemiarges cf. leviculus, Hemiarges cf. paulianus
Hemiarges cf. leviculus Bradley 1930 trilobite
Hemiarges cf. paulianus Clarke 1894 trilobite
 Odontopleurida - Odontopleuridae
Apianurus sp.
Apianurus sp. Whittington 1956 trilobite
 Proetida - Otarionidae
Otarion cf. trentonensis
 Proetida - Proetidae
Cyphoproetus sp.
Cyphoproetus sp. Kegel 1927 trilobite
 Proetida - Dimeropygidae
Dimeropyge sp.
Dimeropyge sp. Opik 1937 trilobite
 Harpetida - Harpetidae
Dolichoharpes sp.
Dolichoharpes sp. Whittington 1949 trilobite
 Asaphida - Asaphidae
Isotelus sp., Anataphrus sp.
Isotelus sp. Dekay 1824 trilobite
Anataphrus sp. Whittington 1954 trilobite
 Asaphida - Remopleurididae
Hypodicranotus aff. striatulus
Hypodicranotus aff. striatulus Walcott 1875 trilobite
 Phacopida - Pterygometopidae
Calyptaulax sp., "Calyptaulax lincolnensis" = Sceptaspis lincolnensis, Denella cumera n. sp., Chasmops sp. n. sp.
Calyptaulax sp. Cooper 1930 trilobite
"Calyptaulax lincolnensis" = Sceptaspis lincolnensis Branson 1909 trilobite
"Calyptaulax"
Denella cumera n. sp. Ludvigsen and Chatterton 1982 trilobite
"Eomonorachus"
Chasmops sp. n. sp. M'Coy 1849 trilobite
 Phacopida - Encrinuridae
Cybeloides sp.
Cybeloides sp. Slocum 1913 trilobite
 Phacopida - Cheiruridae
"Sphaerocoryphe robustus" = Sphaerocoryphe robusta, Ceraurus mackenziensis n. sp., Ceraurinus serratus n. sp., Ceraurinella brevispina n. sp., ? Acanthoparypha goniopyga n. sp., Borealaspis biformis, Borealaspis whittakerensis
"Sphaerocoryphe robustus" = Sphaerocoryphe robusta Walcott 1875 trilobite
Ceraurus mackenziensis n. sp. Ludvigsen 1979 trilobite
Ceraurinus serratus n. sp. trilobite
Ceraurinella brevispina n. sp. Ludvigsen 1979 trilobite
? Acanthoparypha goniopyga n. sp. Ludvigsen 1979 trilobite
Borealaspis biformis Ludvigsen 1976 trilobite
Borealaspis whittakerensis Ludvigsen 1976 trilobite
Ostracoda
 Palaeocopida - Bolliidae
Dicranella bicornis
 Palaeocopida - Oepikellidae
Oepikella labrosa, Oepikium sp.
Oepikium sp. Agnew 1942 ostracod
 Palaeocopida - Eurychilinidae
Eurychilina prairiensis
 Palaeocopida - Tvaerenellidae
Diplopsis socialis
Diplopsis socialis Levinson 1961 ostracod
 Palaeocopida - Tetradellidae
? Tetradella sp., Ceratopsis quadrifida
? Tetradella sp. Ulrich 1890 ostracod
 Palaeocopida - Aparchitidae
Aparchites fimbriatus
Aparchites fimbriatus ostracod
"Aparchites"
 Palaeocopida - Schmidtellidae
Schmidtella affinis
 Palaeocopida - Cryptophyllidae
Milleratia sp.
 Palaeocopida - Lomatopisthiidae
Bolbopisthia sp.
 Podocopida - Bairdiocyprididae
Bairdiocypris cylindrica
 Podocopida - Bairdiidae
? Krausella cf. acuta, Krausella inaequalis