District of Mackenzie Ceraurinella nahanniensis zone: Chazyan, Canada

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Onychoplesia sp.
Tetradellina sp. n. sp.
Wincellatia sp. n. sp.
Phylloporinida indet.
Trilobita - Corynexochida - Styginidae
Trilobita - Corynexochida - Illaenidae
Bumastoides lenzi (Chatterton and Ludvigsen 1976)
Nanillaenus mackenziensis Chatterton and Ludvigsen 1976
Trilobita - Proetida - Telephinidae
Carrickia pinguimitra Chatterton and Ludvigsen 1976
recombined as Phorocephala pinguimitra
Trilobita - Proetida - Dimeropygidae
Dimeropyge clintonensis Shaw 1968
    = Dimeropyge speyeri Chatterton 1994
Chatterton 1994
Trilobita - Harpetida - Harpetidae
Dolichoharpes aff. reticulata Whittington 1949
Trilobita - Odontopleurida - Odontopleuridae
Apianurus parabarbatus Chatterton and Ludvigsen 1976
Ceratocephala triacantheis Whittington and Evitt 1953
Trilobita - Lichida - Lichidae
Amphilichas conradi Chatterton and Ludvigsen 1976
Amphilichas aff. aspratilis (Bradley 1930)
Hemiarges turneri Chatterton and Ludvigsen 1976
Trilobita - Asaphida - Remopleurididae
Remopleurides pattersoni Chatterton and Ludvigsen 1976
Trilobita - Asaphida - Asaphidae
Isotelus parvirugosus Chatterton and Ludvigsen 1976
Nahannia humilisulcata Chatterton and Ludvigsen 1976
Trilobita - Phacopida - Pterygometopidae
Calyptaulax callirachis (Cooper 1953)
Trilobita - Phacopida - Cheiruridae
Acanthoparypha evitti Chatterton and Ludvigsen 1976
Acanthoparypha echinoderma Chatterton and Ludvigsen 1976
Pandaspinapyga dactyla Chatterton and Ludvigsen 1976
Sphaerocoryphe cf. pemphis
    = Holia glabra Adrain 1998
Adrain 1998
Ceraurinella nahanniensis Chatterton and Ludvigsen 1976
Ceraurinella kingstoni Chatterton and Ludvigsen 1976
Heliomeroides teres Evitt 1951
Sphaerexochus arenosus Chatterton and Ludvigsen 1976
Trilobita - Phacopida - Encrinuridae
Encrinuroides rarus (Walcott 1877)
    = Walencrinuroides rolfi Moss and Westrop 2014
Moss and Westrop 2014
Cybeloides cimelia Chatterton and Ludvigsen 1976
Ostracoda - Palaeocopida - Cryptophyllidae
Cryptophyllus oboloides
Ostracoda - Palaeocopida - Lomatopisthiidae
Bolbopisthia ludvigseni
Ostracoda - Palaeocopida - Leperditellidae
Leperditella sp.
Leperditella mundula
Ostracoda - Palaeocopida - Hollinidae
Eohollina depressa
Ostracoda - Podocopida - Steusloffinidae
Steusloffina borealis
Ostracoda - Podocopida - Bairdiocyprididae
Bairdiocypris cf. granti
Ostracoda - Podocopida - Bairdiidae
Krausella ? minuta
Ostracoda - Podocopida - Beecherellidae
Platyrhomboides quadratus
Ostracoda - Hollinocopida - Eurychilinidae
Eurychilina sunbloodensis
Ostracoda - Hollinocopida - Euprimitiidae
? Echinoprimitia sp. n. sp.
? Euprimitia krafti
Ostracoda - Hollinocopida - Tetradellidae
Piretia sp. n. sp. Jaanusson 1957
Tetradella perplexa
Ostracoda - Leperditellocopida - Primitiidae
? Ectoprimitia pustulosa
Ostracoda - Leperditellocopida - Schmidtellidae
Schmidtella affinis
Ostracoda - Leperditellocopida - Aparchitidae
Aparchites sp.
"Aparchites"
Aparchites fimbriatus
"Aparchites"
Ostracoda - Sigmoopsidae
Oecematobolbina varicata
Ostracoda - Leperditicopida - Leperditiidae
Eoleperditia sp. Swartz 1949
Ostracoda
Ludvigsenites mackenziensis
Stenolaemata - Trepostomata
Trepostomata indet. Ulrich 1882
Stenolaemata - Cryptostomata - Arthrostylidae
Helopora spp.
Stenolaemata - Cryptostomata - Rhinidictyidae
Pachydictya sp. Ulrich 1882
Stictopora sp. Hall 1847
Rhynchonellata - Rhynchonellida - Trigonirhynchiidae
Rostricellula sp. Ulrich and Cooper 1942
Rhynchonellata - Orthida - Glyptorthidae
Glyptorthis cf. costellata Cooper 1956
Rhynchonellata - Orthida - Plaesiomyidae
Chaulistomella cf. nitens
Rhynchonellata - Orthida - Plectorthidae
Mimella aff. globosa (Willard 1928)
Strophomenata - Strophomenida - Rafinesquinidae
? Macrocoelia sp.
synonym of Colaptomena
see common names

Geography
Country:Canada State/province:Northwest Territories
Coordinates: 62.0° North, 127.0° West (view map)
Paleocoordinates:6.3° North, 59.7° West
Basis of coordinate:estimated from map
Geographic resolution:basin
Time
Period:Ordovician
10 m.y. bin:Ordovician 2-4
*Period:Middle Ordovician *Epoch:Llanvirn
*Local age/stage:Late/Upper Chazyan
Key time interval:Chazyan Trilobite zone: Ceraurinella nahanniensis
Age range of interval:470.00000 - 457.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Esbataottine
Stratigraphic resolution:formation
Lithology and environment
Primary lithology:gray argillaceous,silty "limestone"
Lithology description: ...medium to dark grey, microcrystalline to finely crystalline, thin- to medium-bedded, commonly argillaceous and silty limestones that weather banded grey and buff.
Environment:carbonate indet. Tectonic setting:passive margin
Geology comments: Environmental and Tectonic Setting calls by S.M. Holland
Taphonomy
Modes of preservation:body,replaced with silica
Size of fossils:macrofossils
Collection methods and comments
Collection methods:bulk,chemical,field collection
Rock censused:0
Reason for describing collection:biostratigraphic analysis
Metadata
Database number:24621
Authorizer:S. Holland, P. Wagner Enterer:S. Holland, P. Wagner
Modifier:M. Hopkins Research group:marine invertebrate
Created:2002-08-12 11:08:31 Last modified:2011-03-16 15:27:31
Access level:the public Released:2002-08-12 11:08:31
Creative Commons license:CC BY
Reference information

Primary reference:
6928. 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]

Secondary references:

23766 J. M. Adrain. 1998. Systematics of the Acanthoparyphinae (Trilobita), with Species from the Silurian of Arctic Canada. Journal of Paleontology 72(4):698-718 [P. Wagner/P. Wagner]
24619 B.D.E. Chatterton. 1994. Ordovician proetide trilobite Dimeropyge, with a new species from northwestern Canada. Journal of Paleontology 68(3):541-556 [P. Wagner/P. Wagner]
53464 D. K. Moss and S. R. Westrop. 2014. Systematics of some Late Ordovician encrinurine trilobites from Laurentian North America. Journal of Paleontology 88(6):1095-1119 [P. Wagner/P. Wagner]