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Definition of paleomagnetic dating

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The Columbia Electronic Encyclopedia, 6th ed. Copyright , Columbia University Press. All rights reserved. See more Encyclopedia articles on: Geology and Oceanography.

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Use of a relative dating method that measures somewhat irregular occurring natural phenomena that have been cross-dated with at least one chronometric technique so that the dates are somewhat comparable from sites in one region to another. Calibrated relative methods could be considered to be somewhere between ordinary relative methods and radiometric methods in terms of their ability to produce dates that closely approximate the actual date of a sample. Amino acid racemization and paleomagnetic dating are generally considered to be either chronometric or calibrated relative methods. It involves flipping four times, while body also spins with five complete rotations on a sideways or downward-facing axis.
Paleomagnetism , or palaeomagnetism , is the study of the record of the Earth's magnetic field in rocks, sediment, or archeological materials. Magnetic minerals in rocks can lock-in a record of the direction and intensity of the magnetic field when they form. This record provides information on the past behavior of Earth's magnetic field and the past location of tectonic plates. The record of geomagnetic reversals preserved in volcanic and sedimentary rock sequences magnetostratigraphy provides a time-scale that is used as a geochronologic tool.

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