Biostratigraphy and trilobite fauna of the lower silurian Tegart formation, southeastern British Columbia

Upper Cambrian to Lower Silurian stratigraphy of a Macdonald Platform-Kechika Trough-Cassiar Terrane transect, Ware, Tuchodi Lakes, Kechika, and Cry Lake map areas (94-F, K, L, 104-P), northeastern British Columbia

10.4095/299864 ◽

2017 ◽

Author(s):

L J Pyle ◽

C R Barnes

Keyword(s):

British Columbia ◽

Upper Cambrian ◽

Lower Silurian

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Conodonts from a platform-to-basin transect, lower Ordovician to lower Silurian, northeastern British Columbia, Canada

Journal of Paleontology ◽

10.1017/s0022336000043493 ◽

2003 ◽

Vol 77 (1) ◽

pp. 146-171 ◽

Cited By ~ 2

Author(s):

Leanne J. Pyle ◽

Christopher R. Barnes

Keyword(s):

British Columbia ◽

New Species ◽

New Genus ◽

Early Ordovician ◽

The Road ◽

Lower Silurian ◽

Lower Ordovician ◽

Conodont Fauna

The conodont fauna from nine sections across a platform-to-basin transect in northeastern British Columbia includes species of Early Ordovician (Tremadocian) to Early Silurian (Llandovery) age. A collection of 9,110 conodont elements was recovered from 205 samples taken from nine stratigraphic sections that preserve the platform succession of the Kechika, Skoki, Beaverfoot, McCusker and Nonda Formations and their off-shelf equivalents, the Ospika, Robb, Kenny and Laurier Formations of the Road River Group. The fauna is assigned to 106 species representing 67 genera; the Ordovician species are representative of two faunal realms. One new genus, left in open nomenclature, is described. Five new species include Drepanoistodus latus and four new species left in open nomenclature assigned to the following genera: Walliserodus, Multioistodus?, Pseudooneotodus, and Belodina. The Midcontinent Realm zones recognized include, in ascending order, the Acodus kechikaensis, Oepikodus communis, Jumudontus gananda, Tripodus laevis to Plectodina aculeata zones, Phragmodus undatus and Gamachignathus ensifer? zones. Zonal species of the Atlantic Realm are Microzarkodina flabellum, Eoplacognathus suecicus, Baltoniodus variabilis, Pygodus anserinus, and Amorphognathus tvaerensis. The Silurian fauna, of lower diversity than the Ordovician fauna, is representative of the Distomodus staurognathoides and Pterospathodus amorphognathoides zones.

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