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TitleUpper 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
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorPyle, L J; Barnes, C R
SourceCentral Foreland NATMAP Project: Proterozoic to Devonian stratigraphic sections in British Columbia and Yukon; by Lane, L SORCID
logo (ed.); MacNaughton, R BORCID logo (ed.); Geological Survey of Canada, Bulletin 603, 2017 p. 7-51, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedThis publication is contained in Central Foreland NATMAP Project: Proterozoic to Devonian stratigraphic sections in British Columbia and Yukon
File formatreadme
File formatpdf; csv; xlsx
ProvinceBritish Columbia
NTS94F; 94K; 94L; 104P
AreaWare; Tuchodi Lakes; Kechika; Cry Lake
Lat/Long WENS-130.0000 -124.0000 60.0000 57.0000
Subjectsregional geology; stratigraphy; paleontology; structural geology; systematic stratigraphy; biostratigraphy; micropaleontology; microfossils; conodonts; lithostratigraphy; geological history; depositional history; tectonic evolution; volcanism; subsidence; thermal history; plate margins; unconformities; facies analyses; continental margins; continental shelf; basins; bedrock geology; lithology; sedimentary rocks; structural features; faults; shear zones; lineaments; cores; core analysis; stratigraphic correlations; Canadian Cordillera; Cordilleran Foreland; Macdonald Platform; Kechika Trough; Cassiar Terrane; Kechika Formation; Mount Sheffield Member; Haworth Member; Grey Peak Member; Quentin Member; Lloyd George Member; Road River Group; Ospika Formation; Cloudmaker Member; Chesterfield Member; Pesika Formation; Kwadacha Formation; Northern Rocky Mountain Trench Fault; Laurentia; Great Slave Shear Zone; Liard Line; Graptolites; Ospika Embayment; Akie Reef; Skoki Formation; Keily Member; Sandpile Formation; Phanerozoic; Paleozoic; Devonian; Silurian; Ordovician; Cambrian
Illustrationslocation maps; geoscientific sketch maps; stratigraphic charts; biostratigraphic charts; block diagrams; stratigraphic cross-sections; lithologic sections; photographs
ProgramCentral Foreland NATMAP Project
ProgramNSERC Natural Sciences and Engineering Research Council of Canada
ProgramLithoprobe Slave-Northern Cordillera Lithospheric Evolution Transect (SNORCLE)
Released2017 12 29
AbstractThe Kechika Formation, a laterally extensive platform-to-basin facies, typically lies unconformably on Cambrian strata. Its five members, which are diachronous, have gradational and conformable contacts. Basinal facies of the Road River Group comprise three formations: the Ospika (Lower to Middle Ordovician), Pesika (Lower Silurian), and Kwadacha (upper Lower Silurian to Lower Devonian). Volcanism, prominent unconformities, and abrupt changes in deposition indicate a complex history delineated temporally by conodont biostratigraphy. Deposition of the Kechika and Ospika formations is attributed to periods of renewed extension followed by thermal subsidence. Silurian units unconformably and conformably overlie the Ospika Formation. The Pesika Formation, a transitional facies, is present mainly in the eastern part of the Kechika Trough. The Kwadacha Formation records an influx of quartz silt and sand into the trough. The Kechika-Road River boundary in the displaced Cassiar Terrane is older than that east of the Northern Rocky Mountain Trench Fault.
Summary(Plain Language Summary, not published)
This bulletin presents detailed descriptions and measured thicknesses for a suite of 79 stratigraphic sections ranging in age from the Late Precambrian to the Devonian, distributed across northern British Columbia and adjacent Yukon. These descriptions permit interpretations of regional trends in the distribution of shallow water vs deeper water successions through early Paleozoic time. This extensive data compilation underpins syntheses, presented here and in external publications, of the changes to the form and depth of western Canada's Paleozoic marginal seas and their implications for regional hydrocarbon potential.

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