CGRG Bibliography of Canadian Geomorphology
Search Results
Author : Allen, S.; and Smith, D.J.
Date : 2004.
Title : Dendroglaciology and lichenometry at Bridge Glacier, British Columbia Coast Mountains: Little Ice Age and Pre-LIA glacial history.
Publication : Association of Washington Geographers Spring 2004 Meeting at University of College of the Fraser Valley, April 23rd and 24th, Abbotsford, British Columbia.
Issue :
Page(s) :
Abstract
Dendroglaciological investigations at Bridge Glacier in the British Columbia Coast Mountains have substantiated the "Bridge Advance", a glacial advance prior to the Medieval Warm Period in Pacific North America, ca. 1500 years B.P. Located on the eastern side of the Pacific Ranges west of Lillooet, Bridge Glacier is a prominent eastward flowing valley glacier whose source area is the Lilloett Icefields. Lichenometric and dendroglaciological investigations have identified 7 distinct Little Ice Age (LIA) moraine-building events that occurred between 1323 and 1931 A.D. The discovery of ice-proximal buried in situ stumps and boles, exposed by recent glacier retreat and stream erosion, provides evidence that Bridge Glacier was advancing down valley into an established >300 year-old forest composed of whitebark pine (Pinus albicaulis Engelm.), Engelmann spruce (Picea engelmannii Parry ex. Engelm.), and subalpine fir (Abies lasiocarpa (Hook.) Nutt) trees between the 5th and 6th centuries A.D. The climatic sensitivity of these buried trees, other detrital wood samples and living trees sampled in the surrounding area, provides an opportunity to develop tree ring chronologies that span the last 1800 years.
Bibliography of Canadian Geomorphology