By measuring the direction and intensity of magnetism in rocks of
different ages, a record of the Earth's magnetic field in the past
can be obtained. This 1994 book deals with the particular case of
reversals of the Earth's magnetic field. These have played a major
role in the development of plate tectonics and in establishing a
geological time scale. The magnetism of rocks is discussed in some
detail with a warning of possible misinterpretations of the record.
Observational results and theories are reviewed with special
attention to the structure and geometry of the transition field.
Changing conditions at the core-mantle boundary, their effect on
reversals, the generation of plumes and the possible correlation of
reversals with tectonic changes, ice ages or mass extinctions are
thoroughly discussed, including suggested periodicities in the
reversal record and in other geophysical data.
General
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