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Science 9 April 1971:
Vol. 172. no. 3979, pp. 157 - 159
DOI: 10.1126/science.172.3979.157
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Articles

Geomagnetic Reversals during the Phanerozoic

Michael W. McElhinny 1

1 Department of Geophysics and Geochemistry, Australian National University, Canberra, A.C.T.

An antalysis of worldwide paleomagnetic measurements suggests a periodicity of 350 x 106 years in the polarity of the geomagnetic field. During the Mesozoic it is predominantly normal, whereas during the Upper Paleozoic it is predominantly reversed. Although geomagnetic reversals occur at different rates throughout the Phanerozoic, there appeaars to be no clear correlation between biological evolutionary rates and reversal frequency.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Geological Rhythms and Cometary Impacts.
M. R. Rampino, M. R. RAMPINO, and R. B. STOTHERS (1984)
Science 226, 1427-1431
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Science. ISSN 0036-8075 (print), 1095-9203 (online)