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Book Chapter

The life and times of the Cordilleran Ice Sheet around the southern Fraser Plateau, British Columbia

By
Tracy A. Brennand
Tracy A. Brennand
Department of Geography, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
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Olav B. Lian
Olav B. Lian
Department of Geography, University of the Fraser Valley, 3844 King Road, Abbotsford, British Columbia V2S 7M8, Canada
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Andrew J. Perkins*
Andrew J. Perkins*
Department of Geography, University of the Fraser Valley, 3844 King Road, Abbotsford, British Columbia V2S 7M8, Canada
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Published:
January 01, 2014

Abstract

This field guide focuses on glacial history, dynamics and processes, and postglacial landscape adjustments in the southern Fraser Plateau region. Located between the Coast and Columbia Mountains in south-central British Columbia, Canada, the southern Fraser Plateau was near the geographic center of the last (marine oxygen isotope stage [MIS] 2) Cordilleran Ice Sheet (CIS). The transition from cold to warm-based ice during MIS 2 is recorded in till sedimentology and structural geology. The perceived absence of large deglacial recessional moraines has been used as evidence that ice regionally stagnated because of a rapid rise in equilibrium line altitude. However, glacioisostatic rebound orientations, ice-marginal channel and grounding-line and push moraine distributions, and reconstructions of late-glacial ice-marginal lake evolution suggest a systematic northwestward pattern of active ice-margin retreat toward the Coast Mountains, accompanied by regional thinning. Eskers and erosional corridors record drainage of supraglacial lakes or ice-marginal water sources in or over thin ice. Many ice-dammed lakes drained catastrophically. Following lake drainage, streams incised valley fills, leaving behind terraces capped by paraglacial fans and eolian sediment. In sum, we examine (1) valley-fill sediments that record Quaternary history dating back to the early or mid-Pleistocene; (2) till, moraines, erosional corridors, and eskers that provide evidence for MIS 2 CIS dynamics and hydrology; (3) late-glacial ice-marginal lake sediments and landforms that allow reconstruction of lake evolution and drainage, and changing ice-margin positions; and (4) the character and ages of river terraces, paraglacial fans, and eolian sediments that record the timing and nature of postglacial landscape adjustments.

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Contents

GSA Field Guide

Trials and Tribulations of Life on an Active Subduction Zone: Field Trips in and around Vancouver, Canada

Shahin Dashtgard
Shahin Dashtgard
Department of Earth Sciences Simon Fraser University 8888 University Drive Burnaby, British Columbia V5A 1S6, Canada
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Brent Ward
Brent Ward
Department of Earth Sciences Simon Fraser University 8888 University Drive Burnaby, British Columbia V5A 1S6, Canada
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Geological Society of America
Volume
38
ISBN electronic:
9780813756387
Publication date:
January 01, 2014

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