The Brandon Hills, formed during the deglaciation of southwestern Manitoba in Late Wisconsinan time, are usually mapped as end moraine, although glaciofluvial deposits are common and are responsible for some distinctive landforms. In the central and western part of the study area a series of subparallel ridges, composed of glaciofluvial deposits overlain by up to 5 m of till, are believed to have originated when sediments were deposited in a series of tunnels within or beneath the ice. Near the eastern end of the hills, a prominent ridge, 4 km long and up to 60 m high, exhibits many of the attributes of an esker. A smaller ridge on the south side of the hills is also esker-like in form.The pebble lithology of the till and of the glaciofluvial deposits is similar and is dominated by material derived from the Precambrian Shield and the Paleozoic outcrop belt to the northeast rather than from local shale bedrock. Dolomite in the till exhibits bimodal frequency distribution with the terminal grade < 0.062 mm.

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