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Eva Interglaciation Forest Bed, Unglaciated E-C Alaska

Eva Interglaciation Forest Bed, Unglaciated E-C Alaska

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Full Title: Eva Interglaciation Forest Bed, Unglaciated East-Central Alaska: Global Warming 125,000 Years Ago

Authors: Troy L. Péwé, Glenn W. Berger, John A. Westgate, Peter M. Brown, and Steven W. Leavitt


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The ancient, boreal Eva forest, buried in frozen loess of the subarctic, forms the centerpiece in this evaluation of the time and nature of the environment during an interglaciation warmer than that of the present. This book brings together results of examination of hundreds of loess exposures over the past 50 years, when loess faces were still frozen in gold-mining excavations, and new data on the character and age of the deposits from fission-track dating of tephra, paleomagnetism of the loess, thermoluminescence dating of loess, and new radiocarbon dating by liquid scintillation. Dendrochronology studies of trees and 13C/12C isotopic ratios of wood from the Eva forest bed are compared to those from trees of the modern boreal forest. This last interglaciation of 125,000 years ago is demonstrated for the first time to be a period of major erosion of loess and deep and rapid thawing of permafrost, followed by emplacement of the Eva forest bed. During the past 100,000 years, the treeless steppe environment returned and the deposits were refrozen.

[ Table of Contents ]

Published: 9/05/1997

ISBN Number: 0813723191

Pages: 54

Product Category: Special Papers