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TitleGeology of the Toad River area (NTS 94N), northeast British Columbia
AuthorMcMechan, M; Ferri, F; MacDonald, L
SourceBritish Columbia Ministry of Energy, Mines and Petroleum Resources, Geoscience Reports 2012, 2012 p. 17-40
Alt SeriesEarth Sciences Sector, Contribution Series 20110326
File formatpdf
ProvinceBritish Columbia
AreaLiard River; Toad River
Lat/Long WENS-126.0000 -124.0000 60.0000 59.0000
Subjectsstratigraphy; structural geology; bedrock geology; sedimentary rocks; shales; siltstones; sandstones; limestones; structural features; folds; faults; hydrocarbons; hydrocarbon potential; Besa River Formation; Toad Formation; Grayling Formation; Garbutt Formation; Buckinghorse Formation; Liard Fold; Thrust Belt; Tuchodi Formation; Muskwa Group; Mount Roosevelt Formation; Kechika Group; Nonda Formation; Muncho-McConnell Formation; Liard FormationWokkpash Formation; Stone Formation; Dunedin Formation; Mattson Formation; Kindle Formation; Tika formation; Fantasque Formation; Liard Formation; Luddington Formation; Baldonnel Formation; Pardonet Formation; Chinkeh Formation; Scatter Formation; Lepine Formation; Sikanni Formation; Sully Formation; Dunvegan Formation; Kotaneelee Formation; Wapiti Formation; Paleozoic; Cambrian; Ordovician; Silurian; Mississippian; Carboniferous; Permian; Triassic; Jurassic; Cretaceous; Mesozoic
Illustrationslocation maps; photographs; cross-sections
ProgramYukon Sedimentary Basins, GEM: Geo-mapping for Energy and Minerals
LinksOnline - En ligne
AbstractRegional mapping within the Toad River map area (NTS 094N) during the summer of 2011 will be incorporated with published and unpublished geological studies, including the unpublished detailed mapping along the Liard River corridor for BC Hydro, to update the geological database of this map area. More than 8000 m of strata spanning the Mesoproterozoic to Upper Cretaceous occur in the area. Abrupt changes in thickness and facies, and the local absence of specific stratigraphic intervals indicate that block faulting was active during the Middle Cambrian, Ordovician to Silurian, Mississippian to Permian, and Jurassic to Early Cretaceous (pre-Albian). These early faults were commonly reactivated during Cretaceous shortening and controlled the trend and position of younger structures. Thrust faulting is the dominant form of shortening within the competent Mesoproterozoic to Paleozoic successions, whereas detachment folding is the prevailing mechanism within the interlayered competent and incompetent Upper Devonian to Cretaceous successions. Principal detachment horizons include Upper Devonian to Mississippian shale of the Besa River Formation, Triassic shale and siltstone of the Toad/Grayling formations and shale of the Lower Cretaceous Buckinghorse and Garbutt formations. Shortening at the top of the Triassic in the eastern part of the Rocky Mountain Foothills near the Toad River is estimated to be approximately 5 - 6 km. Shortening at the top of the Triassic across the eastern part of the Liard Fold and Thrust Belt is even less. Hydrocarbon resources occur within large, structural culminations of the Beaver River and Crow River gas fields. In addition, the Paleozoic and Mesozoic successions contain several organic-rich horizons (Besa River Formation, Toad/Grayling formations and Garbutt Formation) that are stratigraphically equivalent to sequences being developed for shale gas resources elsewhere within the Western Canada Sedimentary Basin.