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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 31 (1961)No. 3. (September), Pages 448-452

Remanent Magnetism in Silts of Pleistocene Age from North America

W. Harrison, J. Terasmae

ABSTRACT

Remanent magnetizations of 64 silt specimens of Kansan, Illinoian, Sangamon, and Wisconsin age are reported. All, except some of the Illinoian specimens, are apparently normally magnetized. The primary magnetic fabrics of the Kansan, Sangamon, and Wisconsin specimens may have been deformed slightly by the consolidating effects of overriding Pleistocene ice sheets. Twenty-two specimens from the basal part of an Illinoian glaciolacustrine silt display a confusion of north-magnetic-pole plots, 21 of the plots lying between latitudes 18°S to 88°N and longitudes 7° to 176°W. This apparent confusion of the magnetic field corresponds to the time of the Illinoian glacial maximum in southern Indiana. Nine specimens from the upper part of the Illinoian silt unit, representative f post glacial-maximum time, are normally magnetized.


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