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Date Permissions Signed
Date of Award
Master of Science (MS)
Easterbrook, Don J., 1935-
Beck, Myrl E.
Rahm, David A., 1931-
Establishment of late Pleistocene geomagnetic polarity events would provide useful time indices for regional and interregional stratigraphic correlations. Development of a geomagnetic polarity scale tied to radiocarbon dating for the Puget Lowland helps to elucidate the possible occurrence of world-wide (dipole) reversed events during the last 50,000 years. Stability and reliability tests indicate that late Pleistocene sediments exposed in the Puget Lowland record valid paleomagnetic directions. Puget Lowland geomagnetic polarity for the interval 11,000 years to 30,000 years BP was normal except for a short reversed period between 20,000 years and 15,000 years BP. In addition to sampling errors and magnetic remanence directional errors, variations in paleomagnetic directions over short time periods may be due to secular variation. The brief period of reversed polarity could have been due to the non-dipole field rather than the dipole field. Interregional comparison of available geomagnetic polarity results for the last 50,000 years does not establish the occurrence of a dipole reversed event. Recorded reversed paleomagnetic directions during the last 50,000 years may represent localized geomagnetic excursions. Resolution of the details of geomagnetic behavior could result in the development of regional geomagnetic time scales for the late Quaternary.
Western Washington University
Puget Lowland (Wash.)
Copying of this thesis in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Othberg, Kurt L., "Paleomagnetism of Late Pleistocene Sediments, Puget Lowland, Washington" (1973). WWU Graduate School Collection. 670.