> Hi there!
>
> Does anyone know when was the last inversion in the earth magnetic field?
It is generally referred to as the reversal of the magnetic field. There
was a reversal at 780,000 years ago. The period prior to that is known as
the Matuyama epoch in which all rocks were reversely magnetised to those of
today. References available upon request. For those young-earth
creationists who follow Barnes who says that a reversal is impossible, the
sun reverses magnetism every 11 years. It is called the Hale cycle.
glenn
see http://www.flash.net/~mortongr/dmd.htm
for lots of creation/evolution information
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