Mesozoic Palaeomagnetic Reversal Column

Details Mesozoic Palaeomagnetic Reversal Column Mesozoic Palaeomagnetic Reversal Column

Oct 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971natur.233..545c&link_type=abstract

Nature, Volume 233, Issue 5321, pp. 545-546 (1971).

Physics

11

Scientific paper

THE frequency of geomagnetic field reversals has not been constant throughout Phanerozoic time and there have been long intervals during which few, if any, reversals occurred; this is in contrast to the Tertiary, for example, when a reversal occurred, on average, every 0.23 m.y. in the interval1 0 to 10.6 m.y. The first long interval of fixed (reversed) polarity was discovered by Irving and Parry2 and named by them the Kiaman Magnetic Interval. It extended from 290 until 230 m.y. ago approximately. More recently, Helsley and Steiner3 have pointed out that the topmost of the lower and nearly all of the Upper Cretaceous was an interval of predominantly normal polarity (from about 120 until 70 m.y. BP).

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