Geomagnetic excursions and climate change: Reply to Comment by M. R. Rampino

Kent, Dennis V.

Rampino is correct in stating that, unlike NRM intensity fluctuations observed in some cores, anomalous NRM directions interpreted as geomagnetic excursions are not readily explained by changes in lithology and magnetic mineral content. The question of excursions, particularly their temporal and spatial distribution, can be argued at length (see, for example, ref. 2). Here I will simply illustrate some of the associated problems by considering the record of purported excursions in a single critical core, V20-108, which provides an important basis for several contributions seeking a link between geomagnetism and climate.



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Lamont-Doherty Earth Observatory
Biology and Paleo Environment
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January 20, 2012