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TitleGeology, Mount Joyal, Yukon
AuthorLane, L S
SourceGeological Survey of Canada, Canadian Geoscience Map 73, 2013, 1 sheet,
PublisherNatural Resources Canada
Maps1 map
Map Info.geological, bedrock geology, structural features, 1:50,000
ProjectionUniversal Transverse Mercator Projection, zone 8 (NAD83)
Mediaon-line; digital
RelatedThis publication is superceded by Lane, L S; (2013). Geology, Mount Joyal, Yukon, Geological Survey of Canada, Canadian Geoscience Map no. 73, ed. 2, Prelim.
File formatreadme
File formatrtf; pdf; shp; xls; xml; JPEG2000
AreaMount Joyal
Lat/Long WENS-137.0000 -136.5000 66.7500 66.5000
Subjectsstratigraphy; structural geology; metamorphism; bedrock geology; structural features; folds; faults; deformation; sedimentary rocks; sandstones; shales; limestones; Cody Creek Formation; Burnthill Creek Formation; Fishing Branch Formation; Parkin Formation; Whitestone River Formation; Ettrain Formation; Hart River Formation; Ford Lake Shale; Mesozoic; Cretaceous; Paleozoic; Carboniferous; Devonian
ProgramYukon Sedimentary Basins, GEM: Geo-mapping for Energy and Minerals
Released2013 04 25
AbstractThis map is dominated by a broad anticline-syncline fold pair. The Tuttle anticline and North and South Tuttle synclines are developed in shale and coarse clastic rocks of the uppermost Imperial and overlying Tuttle formations. Biostratigraphic ages vary from Late Frasnian (Late Devonian) to Viséan (Early Carboniferous). Along the east margin of the map area, the Deception fault juxtaposes the middle, sandy part of the Imperial Formation, of Frasnian to early Famennian age, against the Tuttle Formation. A distinct thermal maturity discontinuity occurs across the fault, with rocks to the east having vitrinite reflectances (Ro) of 1.16-1.3% whereas those to the west have Ro = 0.7-0.8%. Seismic reflection data suggest that the fault has a moderate eastward dip. Taken together, these data indicate that the Deception Fault is a substantial thrust fault. Sandstone and conglomerate of the Tuttle Formation display rapid lateral variations in thickness and facies. This is reflected in the delineation of four mappable lithofacies with no specific stratigraphic order. Although poor exposure precludes a definitive explanation, a channellized depositional system is inferred.
Summary(Plain Language Summary, not published)
This new 1:50,000 scale map is a product of the Geo-mapping for Energy and Minerals (GEM) Program. The area has never been mapped except at an initial reconnaissance scale. The new map provides important new insights on the sedimentary geology of Paleozoic rocks, in an area of current interest for petroleum exploration.