Abstract: Uplands in west-central Yukon supported alpine ice centres during the pre-Reid glaciations (Early Pleistocene). Subdued cirque forms are thought to be glacial cirques that have undergone degradation by nivation. The paleo-equilibrium line altitude (ELA) dropped as low as 1054 ± 96 m in the Crag Mountain upland (CMU). A pre-Reid age for the CMU cirques is based upon the presence of an Early-Middle Pleistocene paleosol in a moraine feature. Cirques in the Ogilvie Mountains provide proxy ELAs for the Reid (mean 1391 ± 132 m) and McConnell (mean 1488 ± 103 m) glaciations. Cirque glaciers did not form in CMU and most of Dawson Range during these later
glaciations due to a decrease in precipitation. It is suggested that the progressive marginality of cirque glaciation through the Middle and Late Pleistocene may be related to the progressive enlargement of precipitation-diverting continental ice sheets east of the Cordillera.

Authors: Nelson, F.E.N. and Jackson, L.E., Jr.

Keywords: Surficial Geology

NTS Mapsheet(s): 115N

Citation: Nelson, F.E.N. and Jackson, L.E., Jr., 2003. Cirque forms and alpine glaciation during the Pleistocene, west-central Yukon. In: Yukon Exploration and Geology 2002, Emond, D.S. and Lewis, L.L. (eds.), Indian & Northern Affairs Canada/Department of Indian & Northern Development: Exploration & Geological Services Division, p. 183-198.

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