The Toshingermann Lakes map area straddles the northwestern extent of the Ruby and Nisling ranges. Broad treeless uplands dominate the landscape and summits reach more than 1800 m above sea level. Upland surfaces are covered with weathered bedrock colluvium and sporadically distributed till deposits from alpine glaciers and ice sheets. Upland surficial deposits are affected by active periglacial processes such as cryoturbation, nivation and solifluction.

The Talbot Creek map area straddles the Ruby and Nisling ranges. Broad treeless uplands dominate the landscape with summits reaching 2100 m above sea level in the Ruby Range and 1800 m above sea level in the Nisling Range. Upland surfaces are covered with weathered bedrock colluvium and sporadically distributed till deposits from former alpine glaciers and ice sheets. Upland surficial deposits are affected by active periglacial processes such as cryoturbation, nivation and solifluction.

The Rhyolite Creek map area is on the northeastern side of the Nisling Range. Summits and ridges in this part of the Nisling Range are between 1400 m and 1800 m above sea level. Much of the upland surface is treeless and is covered with weathered bedrock colluvium. Upland surficial deposits are affected by active periglacial processes such as cryoturbation, nivation and solifluction.

This map is a Yukon Geological Survey contribution to the Geological Survey of Canada Geo-mapping for Energy and Minerals (GEM) program, Multiple Metals Northwest Canadian Cordillera (MMNCC) project.

Preliminary geological map (1:50,000 scale) of Grass Lakes area, Pelly Mountains, southeastern Yukon Territory (NTS 105G/7) including geological cross sections and mineral occurrences.

The Granite Creek map area includes the southwestern section of the Gustavus Range. This area hosts summits approximately 2000 m in elevation. Granite and Albert creeks drain into Roop Lakes, through the wide, u-shaped lower Granite Creek valley. Keystone Creek flows in a narrow, bedrock-controlled valley. Lower Granite creek flows through the middle of the valley, depositing modern fluvial gravel and a blanket of organic material on the floodplain. Till from four alpine sources, as well as from the Cordilleran Ice Sheet (CIS), blanket the lower valley and intermix with glaciolacustrine sand and silt. Glaciolacustrine sediment can also be found capping moraines, and on valley walls above lateral moraines deposited when the CIS advanced up lower Granite Creek valley. Glaciofluvial gravel forms a proglacial fan where the former Granite Creek alpine glacier terminated and meltwater channels mark most former ice margins of the CIS. Till from the most recent glaciation is found in alpine glacier and Cordilleran Ice Sheet moraines, as well as in cirque valleys as blankets and veneers where preserved. Loess forms blankets on most gentle slopes, which allows for its preservation. Colluvium veneers, blankets, and fans form below steep slopes with active rockfall. Bedrock outcrops along steep cirque headwalls and in cirque valleys, as well as in Keystone Creek where fluvial downcutting processes are active. Stone stripes formed by frost heaving are found on gentle slopes. Flat upland surfaces host weathered bedrock and mud boils.

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The 115J/06 map area is located at the confluence of the Nisling and Donjek rivers. The main physiographic feature in the map area is the Nisling River valley that separates the Nisling and Dawson ranges. Uplands on either side of the Nisling River valley reach elevations of 1066 m and are unglaciated with exception to the southwest corner. The Nisling River valley reaches 5 km in width.