[meteorite-list] Cyclic mass extinction?

From: Edward R. Hodges <edwardrhodges1_at_meteoritecentral.com>
Date: Thu Apr 22 10:00:10 2004
Message-ID: <006801c233a8$a60a2440$21a7a118_at_san.rr.com>

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    I happened to catch the last few minutes of a show on PBS about =
extinction. One of the scientist had compiled data on thousands of =
extinct species and graphed the times of their extinction. In the =
timeline he created there seemed to be above normal rates of mass =
extinction every 26 million years. Another scientist is working on a =
theory that the sun has a companion star, "Nemesis" that perturbs the =
orbit of comets in the Oort cloud which impact the Earth roughly every =
26 million years.=20
Who can shed some light on this topic? Wouldn't there be clear evidence =
of meteoritic dust fallout in clay deposits in strata spanning every =
26my?=20
Interesting, very interesting. Didn't catch the name of the show, or the =
names of the scientists.- Edward

Edward R. Hodges
www.meteoriteonline.com
IMCA#4173


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<DIV><FONT face=3D"Arial Black">&nbsp;&nbsp;&nbsp; I happened to catch =
the last=20
few minutes of a show on PBS about extinction. One of the scientist had =
compiled=20
data on thousands of extinct species and graphed the times of their =
extinction.=20
In the timeline he created there seemed to be above normal rates of mass =

extinction every 26 million years. Another scientist is working on a =
theory that=20
the sun has a companion star, "Nemesis" that perturbs the orbit of =
comets in the=20
Oort cloud which impact the Earth roughly every 26 million years. =
</FONT></DIV>
<DIV><FONT face=3D"Arial Black">Who can shed some light on this topic? =
Wouldn't=20
there be clear evidence of meteoritic dust fallout in clay deposits in =
strata=20
spanning every 26my? </FONT></DIV>
<DIV><FONT face=3D"Arial Black">Interesting, very interesting. Didn't =
catch the=20
name of the show, or the names of the scientists.- Edward</FONT></DIV>
<DIV><FONT face=3D"Arial Black"></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Arial Black">Edward R. Hodges</FONT></DIV>
<DIV><FONT face=3D"Arial Black"><A=20
href=3D"http://www.meteoriteonline.com">www.meteoriteonline.com</A></FONT=
></DIV>
<DIV><FONT face=3D"Arial Black">IMCA#4173</FONT></DIV>
<DIV><FONT face=3D"Arial Black"></FONT>&nbsp;</DIV></BODY></HTML>

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Received on Thu 25 Jul 2002 02:58:14 AM PDT


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