ABSTRACT: Surficial geology, Kimea Creek, British Columbia; (NTS 94 P/10).

CGRG Bibliography of Canadian Geomorphology
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Abstract

Kimea Creek (NTS 94P/10) map area was glaciated by the Laurentide Ice Sheet during the Late Wisconsinan (ca. 25 000-10 000 years ago), which deposited clayey till over most of the area. Glacially streamlined landforms in the northwest quadrant show that the main ice flow was from the northeast. However, most of the area is flat and boggy, with peat accumulations of 2 to 3 m, which locally form hummocky surfaces underlain by discontinuous permafrost. Till is usually found underlying broad forested uplands, which commonly lie only a few metres above the surrounding wetlands. Numerous small moraines and crevasse-fill ridges mark the pattern of glacial retreat and minor readvances. These probably formed when the ice sheet thinned and the ice margin became lobed. During deglaciation, when the ice margin retreated to the northeast, meltwater was routed westward between the ice margin and gradually rising topography to the south. Several large meltwater channels were cut at this time. The southern channels are relatively older than the ones to the north. One of the largest meltwater channels lies in the southern part of the map area, which is currently occupied by Kimea Creek and lower Sahdoanah Creek. This channel was the main drainage when the Petitot River to the north was still covered by ice and the most significant glaciofluvial deposits in the map area are found within its banks. With subsequent ice retreat, younger meltwater channels were cut further northward. The northernmost one is currently occupied by the modern Petitot River.

Bibliography of Canadian Geomorphology