Geology, Corbett Hill, Yukon / [by] L.S. Lane. : M183-1/70-2012E-PDF

"This map is dominated by a single broad structure, the Tuttle anticline, developed in shale and coarse clastic rocks of the uppermost Imperial and Tuttle formations and Ford Lake Shale. A limited expanse of Hart River Formation is preserved in the southwest. Biostratigraphic ages vary from Famennian (Late Devonian) in the Imperial Formation in the north, to Viséan or Serpukhovian (Early Carboniferous) in the Hart River Formation in the southwest. Similar to the adjacent Mount Joyal map area to the north, the 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. The trace of the Tuttle anticline deflects abruptly eastward in the map area. The fold axis appears to be localized where both the lowest and highest thick sandstone-dominated units of the Tuttle Formation thin abruptly eastward. At depth, the Tuttle anticline is poorly resolved in a short seismic reflection profile. However, farther north, seismic images show that the anticline is accommodated at the level of the Ogilvie Formation (limestone) by steep reverse faults"--Abstract.

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