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59:, though this hypothesis has been claimed as "highly speculative" and "refuted". A later study found the deposition of the Ivory Coast strewn field and the onset of the Jaramillo reversal not to be contemporaneous as previously inferred. They are separated in time by 30,000 years.
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that occurred approximately one million years ago. In the geological time scale it was a "short-term" positive reversal in the then-dominant
Matuyama reversed magnetic chronozone; its beginning is widely dated to 990,000 years before the present
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116:"Australasian, Ivory Coast and North American tektite strewnfields - Size, mass and correlation with geomagnetic reversals and other earth events"
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Herrero-Bervera, Emilio, and S. Keith
Runcorn. "Transition Fields during the Geomagnetic Reversals and Their Geodynamic Significance."
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The causes and mechanisms of short-term reversals and excursions like the
Jaramillo, as well as the major field reversals like the
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Lunar and
Planetary Science Conference, 10th, Houston, Tex., March 19–23, 1979, p. 2535-2545.
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Philosophical
Transactions: Mathematical, Physical, and Engineering Sciences,
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Glass, B. P., Swincki, M. B., & Zwart, P. A. (1979).
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Cambridge, Cambridge
University Press, 1999; p. 104.
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Vol. 355 No. 1730 (September 15, 1997), pp. 1713–42.
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Ivory Coast microtektites and geomagnetic reversals
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84:List of geomagnetic reversals
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