A new Late Devonian ostracode fauna and its bearing on the Frasnian–Famennian boundary in western Canada

1982 ◽  
Vol 19 (10) ◽  
pp. 1953-1962 ◽  
Author(s):  
W. K. Braun ◽  
F. Lethiers
Keyword(s):  
Northwest Territories ◽  
Central Europe ◽  
Russian Platform ◽  
Late Devonian ◽  
Western Canada ◽  
Northern Alberta

A new ostracode assemblage, DFr6, characterizes the uppermost Frasnian rock sequences in western Canada. The assemblage or biozone contains elements of both the Frasnian and Famennian ostracode sequences and seems to be intermediate between both faunas, which in main aspects are strikingly different in composition. Similarities between the Devonian ostracodes of western Canada and their time-equivalent faunas of the Russian Platform and adjoining areas suggest the presence of a vast paleobiogeographic faunal province that is distinctly set apart from a "paleo-Tethyan" province whose ostracode representatives are found in central Europe and North Africa.The lower DFr6 subassemblage is contained in the Jean-Marie Member of the Redknife Formation, with the upper DFr6 ostracodes occurring in its upper member and in the Kakisa Formation. Both formations form prominent but lithologically similar carbonate sequences in the southwestern corner of the Northwest Territories and adjoining areas, causing problems in correlations, in particular in subsurface studies. Ostracodes of the upper DFr6 subzone were also recovered from the dolomites of the Winterburn Group of northern Alberta.

Helmolepis cyphognathus, sp. nov., a new platysiagid actinopterygian from the Lower Triassic Sulphur Mountain Formation (British Columbia, Canada)

2005 ◽  
Vol 42 (1) ◽  
pp. 25-36 ◽  
Author(s):  
Andrew G Neuman ◽  
Raoul J Mutter
Keyword(s):  
British Columbia ◽  
New Species ◽  
Central Europe ◽  
Middle Triassic ◽  
Lower Triassic ◽  
Western Canada ◽  
Early Triassic ◽  
East Greenland ◽  
The Family ◽  
A New Species

A new species of stem actinopterygian, Helmolepis cyphognatus sp. nov., is reported from the Lower Triassic Sulphur Mountain Formation of western Canada (probably Smithian). This taxon differs from the only other known Early Triassic platysiagid, H. gracilis from the Lower Triassic Wordie Creek Formation of East Greenland (Griesbachian), in counts of branchiostegal rays, shape of the maxilla, shape (and possibly counts) of extrascapulars, and the size ratio of major opercular bones. In spite of their overall unfavorable preservation, the numerous available specimens amend our knowledge of the little known genus Helmolepis considerably: it has become evident that the morphology of Helmolepis cyphognatus sp. nov. comes closest to Platysiagum minus (Middle Triassic Besano Formation of central Europe). This study suggests placement of the two genera in the family Platysiagidae. Investigation of this new species also shows certain features of the cheek and the caudal fin are more primitive than previously believed, whereas the snout region is probably derived but of yet uncertain affinities in Helmolepis.

Monelasmina besti, a new Schizophoriid Brachiopod from the Upper Devonian of Western Canada

1959 ◽  
Vol 96 (6) ◽  
pp. 470-472 ◽  
Author(s):  
A. E. H. Pedder
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Upper Devonian ◽  
Western Canada ◽  
A New Species

AbstractMonelasmina, previously known only from the Frasnian of Europe, is described and figured from the Hay River formation (Frasnian) of the Northwest Territories, Canada. The specimens are referred to a new species, M. besti.

Stable isotope (δ13Ccarb and org, δ15Norg) and trace element anomalies during the Late Devonian ‘punctata Event’ in the Western Canada Sedimentary Basin

2011 ◽  
Vol 307 (1-4) ◽  
pp. 245-271 ◽  
Author(s):  
Maciej G. Śliwiński ◽  
Michael T. Whalen ◽  
Rainer J. Newberry ◽  
Joshua H. Payne ◽  
Jed E. Day
Keyword(s):  
Stable Isotope ◽  
Trace Element ◽  
Sedimentary Basin ◽  
Late Devonian ◽  
Western Canada ◽  
Western Canada Sedimentary Basin ◽  
Canada Sedimentary Basin

Chemostratigraphy and magnetic susceptibility of the Late Devonian Frasnian–Famennian transition in western Canada and southern China: implications for carbon and nutrient cycling and mass extinction

2015 ◽  
Vol 414 (1) ◽  
pp. 37-72 ◽  
Author(s):  
Michael T. Whalen ◽  
Maciej G. Śliwiński ◽  
Joshua H. Payne ◽  
James E. (JED) Day ◽  
Daizhao Chen ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Nutrient Cycling ◽  
Mass Extinction ◽  
Southern China ◽  
Late Devonian ◽  
Western Canada

The Upper Devonian (Frasnian) conodont sequence in the Lime Creek Formation of north-central Iowa and comparison with Lime Creek ammonoid, brachiopod, foraminifer, and gastropod sequences

1990 ◽  
Vol 64 (4) ◽  
pp. 614-628 ◽  
Author(s):  
Jed Day
Keyword(s):  
United States ◽  
Species Composition ◽  
Northwest Territories ◽  
Upper Devonian ◽  
Western Canada ◽  
North Central ◽  
Conodont Zone ◽  
Lowermost Part ◽  
Conodont Fauna ◽  
First Time

The Upper Devonian (Frasnian) conodont fauna of the Lime Creek Formation of north-central Iowa is dominated by species of Polygnathus. Patterns of species composition and abundance are consistent with the Polygnathus biofacies described from the Frasnian of the Northwest Territories of western Canada. Consequently, the standard Frasnian conodont zones, defined on sequences developed in the Palmatolepis biofacies, are not applicable to the Lime Creek sequence. The Lime Creek conodont sequence correlates with Zones 4, 5 and Faunal Interval 7 of the Frasnian conodont sequence in the Alberta Rockies and with similar sequences in the southwestern United States. The Pb elements of Palmatolepis semichatovae Ovnatanova and Ancyrognathus? deformis (Anderson) are described and illustrated for the first time.In the Lime Creek Formation of north-central Iowa, brachiopods of the lowermost part of the Nervostrophia thomasi Zone of Day (1989a) occur in Zone 4, brachiopods of most of the N. thomasi, Douvillina arcuata, and Cyrtospirifer whitneyi Zones span conodont Zone 5, and the Elita inconsueta and Iowatrypa owenensis Zones occur in Faunal Interval 7. Species of the ammonoid Manticoceras and of the gastropods Floyda, Turbonopsis, and Westerna are restricted to Faunal Interval 7. Species of the calcareous foraminifer Nanicella first occur in Zone 5, and are joined by species of Multiseptida high in Zone 5.

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