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TitleGeology, Grayling River, British Columbia
AuthorMcMechan, M E
SourceGeological Survey of Canada, Canadian Geoscience Map 115, 2013, 1 sheet,
PublisherNatural Resources Canada
Maps1 map
Map Info.geological, bedrock geology, 1:50,000
ProjectionUniversal Transverse Mercator Projection, zone 10 (NAD83)
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; xls; xml; shp; JPEG2000
ProvinceBritish Columbia
AreaGrayling River
Lat/Long WENS-125.5000 -125.0000 59.5000 59.2500
Subjectsstratigraphy; structural geology; bedrock geology; structural features; sedimentary rocks; sandstones; shales; siltstones; Scatter Formation; Garbutt Formation; Liard Formation; Toad Formation; Grayling Formation; Cenozoic; Quaternary; Mesozoic; Cretaceous
ProgramYukon Sedimentary Basins, GEM: Geo-mapping for Energy and Minerals
Released2013 12 12
AbstractThe Grayling River area (NTS 94-N/06) in the western Liard Basin is underlain by Triassic and Lower Cretaceous shale, siltstone and sandstone. A regional unconformity at the base of the Cretaceous down cuts to the north and east. Folds dominate the structural style. These probably formed in the latest Cretaceous and are well exposed along Liard River and where the resistant Liard Formation occurs. A regionally significant change in the orientation of structures from northwest in the Rocky Mountain Foothills (southern part of the area) to north or northeast in the Liard Thrust and Fold Belt (northern part of area) occurs. Cross-cutting faults and highly variable fold trends indicate local regions where both trends are developed. This map incorporates extensive observations from a major unpublished geological study of the Liard River corridor prepared for BC Hydro in 1984 as well as new data collected during field work as part of the GEM project.
Summary(Plain Language Summary, not published)
This is the first detailed (1:50 000 scale) bedrock geological map of the Grayling River area in the western Liard Basin, northeast British Columbia. It shows the surface distribution and structure of the exposed 245 ¿ 125 million year old strata and documents the local complexities found where two different (NE and NW) structural trends occur. The map incorporates new data collected by the GEM project as well as observations from an unpublished 1984 BC Hydro study of the Liard River corridor. The Grayling River area is underlain at 1-3 km depth by a package of 385 -350 million year old organic rich shales that is similar to the strata being developed for shale gas 60 km to the east. The map and associated studies should be of interest to the petroleum industry when the price of natural gas rises and exploration moves westward in the Liard Basin area.