CGRG Bibliography of Canadian Geomorphology
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Author : Denton, J.J.; Laroque, C.P.; Williams, A.E.; and Wilson, P.J.
Date : 1995/6
Title : Proglacial sedimentation in the Loss Creek Valley, southwestern Vancouver Island, British Columbia
Publication : Western Geography
Issue : 5/6:
Page(s) : 1-12
Abstract
A stratigraphic study was conducted on an exposure located in the lower reaches of Loss Creek on Vancouver Island. Dour areas were identified in the 72 m high exposure. The lowest unit is composed of 17 m of laminated clays (Unit 1). The next exposure is a 3m bed of poorly-sorted sand and gravel with a-b planes dipping toward the valley floor (slumped deposit). These are overlain by sand and silt rhythmites (Unit 2), followed by 15 m of trough cross-bedded, coarse sands and gravels, with the beds oriented east to west (Unit 3). The coarsening-upwards sequence is interpreted as a proglacial deposit of lacustrine clays, outwash sands, a braided stream gravels, partly buried by a post-depositional slump. Other deposits at lower elevations and up-valley suggest the area is characterized by a complicated sequence of alternating clay, sand, and gravel layers. These results do not support past research indicating that a single post-Vashon maximum resurgence of the Juan de Fuca ice lobe formed a 460 m ice dam at the mouth of Loss Creek. It seems more likely that the region experienced multiple sequences of advance and retreat phases. Further research is necessary to fully decipher the complex glacial history of this area.
Bibliography of Canadian Geomorphology