Late Wisconsinan paleosols and macrofossils in Chehalis Valley: paleoenvironmental reconstruction and regional significance

Resource type
Thesis type
(Thesis) M.Sc.
Date created
2016-03-30
Authors/Contributors
Abstract
A subalpine coniferous forest occupied the Chehalis Valley before 19,980 ± 70 years BP (UCIAMS 126600), according to plant and insect macrofossils and paleosol evidence preserved in Late Pleistocene-aged sediments. The paleoclimate was similar to the modern Engelmann spruce-subalpine fir (ESSF) ecosystem that occurs at high elevation with cold and wet climates today. The Chehalis Valley evidence challenges the interpretation that the Coquitlam Stade and the Port Moody Interstade were regional and driven by climate change. Coquitlam till is absent from Chehalis and there was a coniferous forest present when other areas in southwest British Columbia were covered by Coquitlam Stade ice.
Document
Identifier
etd9525
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Scholarly level
Supervisor or Senior Supervisor
Thesis advisor: Ward, Brent
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