Late Quaternary stratigraphy, paleoecology, and glacial geology of Southwestern British Columbia :
examples from lower Seymour and Lynn valleys
Field Trip leaders: Olav B. Lian and R.J. Hebda
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The Fraser Lowland and adjacent valleys of southwestern British Columbia, and southern Vancouver Island, collectively contain what is likely the most complete lithostratigraphic record of late Quaternary environments in western Canada . This record begins before the climatic optimum of the last interglaciation (marine oxygen isotope substage 5e), which occurred about 130,000 years ago, and extends to the present. This field trip will introduce participant to part of that record, specifically the lithostratigraphy, paleoecology, and glacial geology of lower Seymour and Lynn valleys which open into the Fraser Lowland immediately north of the city of Vancouver. Exposures in these valleys together reveal an almost complete stratigraphic sequence spanning nearly 50,000 radiocarbon years. Preserved are organic-rich beds that provide insight into the ecology of ancient nonglacial environments, including a significant interval of glacial retreat and reforestation that occurred during the last global glacial maximum. Also preserved are glacigenic deposits that give evidence of the subglacial thermal conditions that ensued in the upland and lowland regions during the last glaciation. The field trip will begin in lower Seymour valley end at the chalet on Grouse Mountain which offers spectacular views (weather permitting) of glaciated mountain and valley landscapes, and of the Fraser Lowland and the city of Vancouver more than 1000 metres below. While at the chalet taking in the view, refreshments and snacks will be available at Altitudes Bistro. Please note that access to Grouse Mountain will depend on the state of the winter snow pack; if access is not possible the trip will end in lower Lynn valley. |
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