The Brachiopod Warrenella in the Lower and Middle Devonian formations of northwestern Canada

Ludvigsen, Rolf; Perry, D. G.

doi:10.4095/103986

Cited by 9 publications

(10 citation statements)

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“…1) near the headwaters of the Broken Skull River. I had hoped to sample the fossiliferous deeper-water equivalents of the Sunblood, Esbataottine, and lower Whittaker formations that are exposed farther to the east in the Mackenzie Mountains ((Ludvigsen, 1975;1979b). This hope was not realized.…”

Section: Introductionmentioning

confidence: 99%

Upper Cambrian and Lower Ordovician trilobite biostratigraphy of the Rabbitkettle Formation, Western District of Mackenzie

Ludvigsen¹

1982

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Section: Introductionmentioning

confidence: 99%

Upper Cambrian and Lower Ordovician trilobite biostratigraphy of the Rabbitkettle Formation, Western District of Mackenzie

Ludvigsen¹

1982

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“…These formations are poorly dated. Scattered fossil collections suggest that each spans the interval of, at least, Franconian to Canadian (Norford and Macqueen, 1975;Gabrielse et al, 1973;Ludvigsen, 1975;Tipnis et al, 1979 (Fig. 1).…”

Section: Geologic Setting and Stratigraphymentioning

confidence: 97%

“…Three formations of Late Cambrian and Early Ordovician age are exposed on the Mackenzie Platform, a stable tectonic element which received dominantly shallowwater sediments from the Helikian to the Late Devonian (Gabrielse, 1967): the Franklin Mountain Formation in the Mackenzie Valley (Norford and Macqueen, 1975), the Broken Skull Formation in the eastern and central Mackenzie Mountains (Gabrielse et al, 1973;Ludvigsen, 1975), and the Rabbitkettle Formation in the western Mackenzie Mountains and the Selwyn Mountains (Gabrielse et al, 1973).…”

Section: Geologic Setting and Stratigraphymentioning

confidence: 99%

Upper Cambrian to Lower Ordovician conodont biostratigraphy and biofacies, Rabbitkettle Formation, District of Mackenzie

Landing¹,

Ludvigsen²,

Bitter³

1980

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Conodonts have been recovered from two sections through the Cambrian-Ordovician boundary beds of the upper Rabbitkettle Formation, near the headwaters of the Broken Skull River, western Mackenzie Mountains. The two sections are separated by a thrust fault. The sequence of trilobite faunas from the low-energy outer shelf facies of the Rabbitkettle is equivalent to the Saukiella junia through Symphysuhna brevispicata subzones from the inner carbonate platform in Oklahoma and Texas. Significant differences in trilobite faunas between the Mackenzie Mountains and United States sequences represent contrasting biofacies developments. Similarly, the sparse and low diversity conodont faunas of the Rabbitkettle resemble coeval Appalachian continental slope and outer shelf faunas rather than those reported from the inner carbonate platform in Texas and Utah. The Proconodontus and Cordylodus oklahomensis (new name) zones can be recognized in the Rabbitkettle but cannot be divided into the subzones established in Utah. These data suggest that lithofacies associations and biofacies developments in conodont distribution may prohibit detailed conodontbased correlations of Cambrian-Ordovician boundary beds.

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“…As a result, the affinity of this biota to other regions has not been fully evaluated, despite the possibility that this biota may contain taxa that show this region to be transitional between Europe and North America. The recognition of Warrenella grinnellensis Li and Jones in Arctic Canada supported such faunal exchange route because this species possesses features of both the Occidentalis and Franklinii lineages of Warrenella recognized by Ludvigsen and Perry (1975) (Li and Jones 2003). The recognition of Warrenella grinnellensis Li and Jones in Arctic Canada supported such faunal exchange route because this species possesses features of both the Occidentalis and Franklinii lineages of Warrenella recognized by Ludvigsen and Perry (1975) (Li and Jones 2003).…”

Section: Stratigraphy and Age Of Bird Fiord Formationmentioning

confidence: 99%

“…During the Devonian, the Canadian Arctic was a biogeographically important region because it may have been the route by which faunal exchanges between North America and Europe took place (e.g., Ludvigsen and Perry 1975;Oliver 2006). A full assessment of this possibility is greatly hindered by the general paucity of faunal information from Arctic Canada, an issue that can be attributed largely to the remote nature of the area.…”

Section: Introductionmentioning

confidence: 99%

Brachiopods from Bird Fiord Formation (Devonian) of Arctic Canada

Jones

2007

Can. J. Earth Sci.

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The upper Lower to Middle Devonian Bird Fiord Formation (late Emsian to late Eifelian) is a carbonatesiliciclastic succession, up to 900 m thick, that contains a diverse brachiopod-dominated fauna. Twenty-two species belonging to 21 genera have been recognized from the collection of more than 45 000 specimens, among which the atrypids form 52% of the biota, spiriferids -13%, orthids -8%, productids -3%, rhynchonellids -2%, terebratulids -1%, and the strophomenids, pentamerids, and athyridids each <1%. Spinatrypina, Schizophoria, Elythyna, Desqumatia (Independentrypa), Cupularostrum, and Atrypa that collectively form more than 80% of the brachiopod biota. The following species are described here: Schizophoria (Schizophoria) sulcata, Ivdelinia grinnellensis, Cupularostrum repetitor, Hypothyridina cf. bifurcata, Atrypa sp., Emanuella bisinuata, Elythyna sverdrupi, Perryspirifer scheii, Costacranaena marlenae. Despite its endemic character, the brachiopod fauna from the Bird Fiord Formation of Arctic Canada can be assigned to the Old World Realm. Its strong affinity to Europe and western Canada supports the notion that, during the Devonian, faunal exchanges between Europe and North America took place via Arctic Canada. Résumé: La Formation Bird Fiord du Dévonien inférieur à moyen (Emsien tardif à Eifelien tardif) consiste en une succession de roches carbonatées-silicoclastiques d'une épaisseur pouvant atteindre 900 m, qui contient une faune variée dominée par des brachiopodes. Vingt-deux espèces appartenant à 21 genres ont été identifiées à partir d'une collection de plus de 45 000 spécimens, dont les atrypides constituent 52 % du biote, les spiriférides,~13 %, les orthides, 8 %, les productides,~3 %, les rhynchonellides,~2 %, les terebratulides,~1 % et les strophoménides, pentamérides et athyridides, < 1 % respectivement. Spinatrypina, Schizophoria, Elythyna, Desqumatia (Independentrypa), Cupularostrum et Atrypa constituent collectivement plus de 80 % du biote des brachiopodes. Les espèces suivantes sont décrites : Schizophoria (Schizophoria) sulcata, Ivdelinia grinnellensis, Cupularostrum repetitor, Hypothyridina cf. bifurcata, Atrypa sp., Emanuella bisinuata, Elythyna sverdrupi, Perryspirifer scheii et Costacranaena marlenae. En dépit de son caractère endémique, la faune de brachiopodes de la Formation Bird Fiord de l'Arctique canadien peut être affectée au Royaume du Vieux Monde. Sa forte affinité avec l'Europe et l'Ouest canadien vient appuyer la thèse voulant que, durant le Dévonien, des échanges fauniques se soient produits entre l'Europe et l'Amérique du Nord par le biais de l'Arctique canadien. [Traduit par la Rédaction] Li and Jones 1311The brachiopod fauna of the Bird Fiord Formation consists of 22 species that belong to 21 genera (Fig. 2). Collectively, the atrypids are most abundant, forming 52% of the collection, the rhynchonellids -2%, spiriferids -13%, orthids -8%, and productids -3%. The terebratulids form slightly over 1% of the collection, whereas strophomenids, pentamerids, and athyridids each for...

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The Brachiopod Warrenella in the Lower and Middle Devonian formations of northwestern Canada

Abstract: A new species is described, based on a single specimen obtained from etching Wenlockian limestones of the Cape Phillips Formation from Baillie Hamilton Island.

Cited by 9 publications

References 0 publications

Upper Cambrian and Lower Ordovician trilobite biostratigraphy of the Rabbitkettle Formation, Western District of Mackenzie

Upper Cambrian and Lower Ordovician trilobite biostratigraphy of the Rabbitkettle Formation, Western District of Mackenzie

Upper Cambrian to Lower Ordovician conodont biostratigraphy and biofacies, Rabbitkettle Formation, District of Mackenzie

Brachiopods from Bird Fiord Formation (Devonian) of Arctic Canada

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