CGRG Bibliography of Canadian Geomorphology
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Author : Conway, K.W.; Barrie, J.V.; and Hebda,R.J.
Date : 2001.
Title : Evidence for a late Quaternary outburst flood event in the Georgia Basin, British Columbia.
Publication : Current Research 2001, Geological Survey of Canada
Issue : 2000-A13.
Page(s) : 17 p.
Abstract
Coring of Late Quaternary sediments in the Georgia Basin has revealed stratigraphic and micropaleontological evidence of an outburst flood that deposited a clay layer over much of the sealer of the Strait of Georgia. The flood originated in the Fraser Valley of the British Columbia interior during deglaciation when an ice-dammed lake or lakes drained catastrophically. A reworked pollen assemblage contained within the clay unit has a source in the Fraser Valley or the British Columbia interior. The clay unit contains a characteristic grain-size structure, sedimentary structures, and a radiocarbon chronology consistent with a rapidly deposited unit emplaced by a flood event. Diatom assemblages show that a markedly lower salinity of surface waters accompanied deposition. Radiocarbon dating indicates that the flood occurred between 9160 and 9800 radiocarbon years BP. The unit correlates well with a somewhat thicker deposit found at Ocean Drilling Program drilling sites in Saanich Inlet.
Bibliography of Canadian Geomorphology