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TitleA new assessment of the Middle and Upper Devonian conodont biostratigraphy of the Horn River Group in the Powell Creek reference section (northern Mackenzie Mountains, NWT, Canada)
AuthorGouwy, S A; Uyeno, T T
SourceFourth International Conodont Symposium. ICOS IV: Progress on Conodont Investigation; by Liao, J -C (ed.); Valenzuela-Ríos, J I (ed.); Cuadernos del Museo Geominero no. 22, 2017 p. 153-156
LinksOnline - En ligne (complete volume - volume complet, pdf, 27.8 MB)
Alt SeriesNatural Resources Canada, Contribution Series 20170025
PublisherInstituto Geológico y Minero de España (Madrid, Spain)
MeetingFourth International Conodont Symposium. ICOS IV: Progress on Conodont Investigation; Valencia; ES; June 25-30, 2017
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories
NTS106I/01; 106I/02; 106I/03; 106I/06; 106I/07; 106I/08
AreaMackenzie Mountains; Mackenzie River; Powell Creek
Lat/Long WENS-129.3333 -128.0000 65.3333 65.1667
Subjectsstratigraphy; paleontology; Upper Devonian; Frasnian; Middle Devonian; Givetian; biostratigraphy; micropaleontology; microfossils; conodonts; fossil zones; bedrock geology; lithology; sedimentary rocks; Horn River Group; Hare Indian Formation; Bluefish Member; Bell Creek Member; Ramparts Formation; Platform Member; Kee Scarp Member; Carcajou Member; Allochthonous Limestone Member; Canol Formation; Imperial Formation; Hume Formation; Kacák Episode; Phanerozoic; Paleozoic; Devonian
Illustrationslocation maps; photographs
ProgramMackenzie Corridor, Shield to Selwyn, GEM2: Geo-mapping for Energy and Minerals
Released2017 01 01
The Powell Creek section (65°16'23.61"N, 128°46'39.95"W) and Tributary section (about 700m NW of the main section) (Fig. 1) were first described and studied by Basset and Stout (1967) and Lenz and Pedder (1972). They were first sampled for conodonts in 1969 by Mackenzie and Pedder and in 1971 by Uyeno (Uyeno, 1971, 1972). The Powell Creek outcrops are an almost continuous exposure of Devonian rocks, without structural complication from the sub-Devonian unconformity to the lowermost part of the Famennian. The remote setting of the outcrop, 100Km from the nearest town (Norman Wells, Fig.1) makes it accessible only by helicopter. This section was selected as reference for the biostratigraphy of Western and Arctic Canada by Uyeno (1978) and is still considered the reference for the area.
In the summer of 2016 the Powell Creek outcrop and tributary section were revisited as part of the second phase of the Geo-mapping for Energy and Minerals (GEM) Program of the Geological Survey of Canada.
Summary(Plain Language Summary, not published)
The Horn River Group consists of the Hare Indian, Ramparts and Canol formations (Fig. 2). It conformably overlies the Eifelian Hume Formation and is overlain by the Frasnian-Famennian Imperial Formation. A total of 92 conodont samples were collected in the 228m thick Horn River Group at Powell Creek and the Tributary section over the last 48 years by GSC researchers.The conodont data distinguish most of the Givetian and several Frasnian conodont zones. Powell Creek is by far the best studied section in the region and a good reference section for the Givetian/Frasnian even though part of the section (Canol Shale) is still being studied.