Xref: utzoo sci.bio:982 sci.misc:958 rec.birds:473
Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!hao!noao!amethyst!hdunne
From: hdunne@amethyst.ma.arizona.edu (|-|ugh)
Newsgroups: sci.bio,sci.misc,rec.birds
Subject: Re: animals and Earth's magnetic reversal
Message-ID: <460@amethyst.UUCP>
Date: 15 Mar 88 01:16:25 GMT
References: <7387@ihlpa.ATT.COM>
Sender: uucp@amethyst.UUCP
Organization: Dept. of Math., Univ. of Arizona at Tucson
Lines: 13

In article <7387@ihlpa.ATT.COM> cutler@ihlpa.ATT.COM (Herber) writes:

}  Will Northern hemisphere birds migrate north
}in the winter?  Are there any indications of specie disappearance during
}these times?

Geomagnetic reversals take place at random intervals on the order of several
million years. Each individual reversal takes about ten thousand years for the
process to be completed.

Hugh Dunne        |  UUCP: ..{cmcl2,ihnp4,seismo!noao}!arizona!amethyst!hdunne
Dept. of Math.    |     Phone:      | ARPA:     hdunne@amethyst.ma.arizona.edu
Univ. of Arizona  | +1 602 621 4766 | Bitnet:   hdunne@arizrvax
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