CGRG Bibliography of Canadian Geomorphology
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Author : Geertsema, M.; and Clague, J.J.
Date : 2005.
Title : -1000-year record of landslide dams at Halden Creek, northeastern British Columbia.
Publication : Joint Meeting of the Geological Association of Canada, the Mineralogical Association of Canada, the Canadian Society of Petroleum Geologists and the Canadian Society of Soil Sciences. May 15-18, 2005. Studley Campus of Dalhousie University, Halifax, Nova Scotia.
Issue :
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Abstract
Large, rapid, low-gradient landslides are common in the clay-rich sediments of northeastern British Columbia. In relatively small watersheds, such as at Halden Creek, landslide dams may persist for years. The events are recorded geologically in two ways. First, trees died in temporary lakes dammed by the landslides and were partially buried by alluvium and preserved from decay. Bank erosion has subsequently exhumed the drowned trees. Second, stream banks expose multiple landslide units separated by organic layers, which represent periods of stability. We have begun to reconstruct a history of landslide damming at Halden Creek by radiocarbon dating exhumed trees and organic layers. We have obtained ages from drowned rooted trees exposed in eroding banks at five locations, and from organic layers and logs at the contacts of slide deposits at eight sites. Drowned trees range in age from 169 ± 59 to 274 ± 49 14C years B.P., and organic layers date from modern to 965 ± 49 14C years B.P
Bibliography of Canadian Geomorphology