Upper Devonian (Frasnian) Conodonts of the Polygnathus Biofacies, N.W.T., Canada

The Polygnathus biofacies characterizes the Frasnian sequence in the Hay River, Trout River, and adjacent areas of the southwestern Northwest Territories. The sequence spans almost the entire Frasnian. Only at certain levels are there minor incursions of species of Palmatolepis, Ancyrodella, and Anc...

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Bibliographic Details
Published in:Journal of paleontology 1985-01, Vol.59 (4), p.904-951
Main Authors: Klapper, Gilbert, Lane, H. Richard
Format: Article
Language:English
Subjects:
Antimony
Biofacies
Conodonta
Fauna
Frasnian age
Geology
Holotypes
Lakes
Marine
Paratypes
Polygnathus
Shales
Trout
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Summary:The Polygnathus biofacies characterizes the Frasnian sequence in the Hay River, Trout River, and adjacent areas of the southwestern Northwest Territories. The sequence spans almost the entire Frasnian. Only at certain levels are there minor incursions of species of Palmatolepis, Ancyrodella, and Ancyrognathus that elsewhere characterize the Palmatolepis biofacies, on which the conodont zonation of the Frasnian is based. The problem of intercorrelation of the two biofacies has not been resolved by this study and correlations with the Palmatolepis biofacies are approximations: the sampled Hay River Formation extends from the Middle or Upper asymmetricus Zone up to the A. triangularis or Lower gigas Zone; part of the Twin Falls Formation is in the Lower gigas Zone; the sampled uppermost Fort Simpson Shale, Redknife and Kakisa formations appear to correlate with the Upper gigas Zone. Although the sequence has only been sampled in a preliminary way, a substantial number of new species have been recognized, probably because there have been few published studies of the Frasnian Polygnathus biofacies. Newly described species are Ozarkodina dissimilis, O. postera, Polygnathus aequalis, P. brevicarina, P. elegantulus, P. evidens, P. gracilis, P. imparilis, P. morgani, P. planarius, P. robustus, P. samueli, P. n. sp. F, and P. n. sp. G.
ISSN:0022-3360
1937-2337