Abstract: The lower and upper members of the Faro Peak formation comprise Upper Triassic and Lower Jurassic successions, respectively, that are assigned to the Yukon-Tanana terrane in the southern Tay River map area (NTS 105K). The lower member is ~650 m-thick and contains a basal conglomerate overlain by argillite, limestone, basalt, and lithic feldspathic wacke to arenite that represents part of an overlap assemblage and regionally covers Paleozoic rocks of the Yukon-Tanana terrane, Slide Mountain terrane, and ancestral Cordilleran margin. The upper member has >800 m of massive conglomerate and sandstone that overlies different stratigraphic levels of the lower member and locally sits on Yukon-Tanana basement. The upper member is coeval with Whitehorse trough strata of central Yukon and similarly records Early Jurassic exhumation of the northern Intermontane terranes. The two members are lithologically distinct, of mappable extent, and have unconformable contacts, and therefore should be separated into two new formations.

Authors: Wiest, A.C., Beranek, L.P. and Manor, M.J.

NTS Mapsheet(s): 105K

Citation: Wiest, A.C., Beranek, L.P. and Manor, M.J., 2020. Upper Triassic to Lower Jurassic stratigraphy of the Faro Peak formation, southern Tay River map area, central Yukon (NTS 105K). In: Yukon Exploration and Geology 2019, K.E. MacFarlane (ed.), Yukon Geological Survey, p. 121-139.

Downloads

Name	Comment
paper	This pdf is 31MB.	Download PDF