ABSTRACT: -Surficial geology, June Lake, British Columbia (94 P/16).

CGRG Bibliography of Canadian Geomorphology
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Abstract

The surficial geology of the June Lake (NTS 94 P/16) map area is dominated by the effects of continental glaciation during the Late Wisconsinan stage (ca. 25 000-10 000 years ago). In general the ice sheet advanced from the northeast, but as the ice thinned during deglaciation, the flow emanated from the Mackenzie River valley from the north-northwest. This ice flow was caused by a lobe in the ice sheet that filled a broad lowland, centered down the east half of the map area. The central axis of the lowland is occupied by a large meltwater channel in which Thinahtea Creek, and a string of small lakes, currently lie. Several eskers also run along the channel floor, which suggest that the channel may have initially formed as a subglacial tunnel. The lobate pattern of the ice margin is marked by numerous small ridges of till, which form nested arcuate patterns. The ridges are thought to be either end moraine segments or crevasse fillings and their arcuate is thought to show the progressive retreat of the ice margin to the northwest, when considered with the nested pattern of meltwater channels. Much of the map area is underlain by thick clayey till, which is poorly drained and covered by extensive muskeg, which forms hummocky peatlands. Areas of thick peat are likely underlain by permafrost and probably contain significant amounts of ground ice.

Bibliography of Canadian Geomorphology