Re: Greenland and Greenland's trade

On Wed, 04 Jan 2006 16:51:49 -0600, kenney@xxxxxxxxxxxxxxxxxxx wrote:

>
>In article <pkGuf.429$x11.92@xxxxxxxx>,
>tmcdonald2672@xxxxxxxxxxxxxxxxxxx (Tom McDonald) wrote:
>
>> Yes; in fact, the orientation of magnetic particles in rocks has
>> been used for relative dating.
>
> The orientation of the magnetic pole and the rate at which it
>switches was established by measuring the magnetic orientation of the
>sea floor next to the Atlantic Rift. Sea floor spreading results in
>the bed containing magnetic stripes of alternating orientation. There
>is one big assumption though, and that is that there have been no
>significant changes in the rate of spreading in the time we are
>interested in.
>

More recently the clock has been confirmed by the examination of the
magnetic product of other submarine rifts.



Eric Stevens

.