District of Mackenzie Bathyurus granulosus zone (Ordovician of Canada)

Where: Northwest Territories, Canada (62.0° N, 127.0° W: paleocoordinates 6.3° N, 59.7° W)

• coordinate estimated from map

• basin-level geographic resolution

When: Bathyurus granulosus trilobite zone, Sunblood Formation, Chazyan (470.0 - 457.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: lithified, gray, sandy limestone

• Environmental and Tectonic Setting calls by S.M. Holland
• medium to dark grey, microcrystalline to finely crystalline limestones which are generally resistant. In a number of localities, the highest Sunblood is marked by an arenaceous interval.

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 24618: 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
Ostracoda
 Leperditellocopida - Schmidtellidae
Schmidtella affinis, Schmidtella cf. subrotunda
 Podocopida - Bairdiidae
Krausella ? minuta
 Palaeocopida - Leperditellidae
Leperditella cf. germana
Trilobita
 Corynexochida - Illaenidae
Bumastoides sp.
Bumastoides sp. Whittington 1954 trilobite
 Proetida - Bathyuridae
Bathyurus granulosus n. sp.
Bathyurus granulosus n. sp. Ludvigsen 1979 trilobite
 Phacopida - Pterygometopidae
Calyptaulax sp.
Calyptaulax sp. Cooper 1930 trilobite
 Phacopida - Encrinuridae
Cybeloides anna n. sp.
Cybeloides anna n. sp. Ludvigsen 1979 trilobite
 Phacopida - Cheiruridae
Pandaspinapyga cf. stubblefieldi
 Asaphida - Asaphidae
Isotelus sp.
Isotelus sp. Dekay 1824 trilobite