[meteorite-list] Cyclic mass extinction?

From: TMS/TNS/HRC <musnat_at_meteoritecentral.com>
Date: Thu Apr 22 10:00:10 2004
Message-ID: <006401c233ab$63ed1060$378d70d1_at_museumst>

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Hi Edward and List,

I took a course in college called Catastrophes and Mass Extinctions. =
Our "textbook" was called "Nemesis the Death Star and Other Theories of =
Mass Extinction." As I recall, Nemesis was not one of the more =
compelling theories, but interesting to contemplate nonetheless.

I will look around for the book and if I can find any more info, I will =
let you know.

Regards and Good Night from rainy rainy Alaska,
Jeannie
The Museum Store/The Nature Source
IMCA #9236
www.thenaturesource.com

  ----- Original Message -----=20
  From: Edward R. Hodges=20
  To: meteorite-list_at_meteoritecentral.com=20
  Sent: Wednesday, July 24, 2002 10:58 PM
  Subject: [meteorite-list] Cyclic mass extinction?


      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 size=3D4>Hi Edward and List,</FONT></DIV>
<DIV><FONT size=3D4></FONT>&nbsp;</DIV>
<DIV><FONT size=3D4>I took a course in college called Catastrophes and =
Mass=20
Extinctions.&nbsp; Our "textbook" was called "Nemesis the Death Star and =
Other=20
Theories of Mass Extinction."&nbsp; As I recall, Nemesis was not one of =
the more=20
compelling theories, but interesting to contemplate =
nonetheless.</FONT></DIV>
<DIV><FONT size=3D4></FONT>&nbsp;</DIV>
<DIV><FONT size=3D4>I will look around for the book and if I can find =
any more=20
info, I will let you know.</FONT></DIV>
<DIV><FONT size=3D4></FONT>&nbsp;</DIV>
<DIV><FONT size=3D4>Regards and Good Night from rainy rainy =
Alaska,</FONT></DIV>
<DIV><FONT size=3D4>Jeannie</FONT></DIV>
<DIV><FONT size=3D4>The Museum Store/The Nature Source</FONT></DIV>
<DIV><FONT size=3D4>IMCA #9236</FONT></DIV>
<DIV><FONT size=3D4><A=20
href=3D"http://www.thenaturesource.com">www.thenaturesource.com</A></FONT=
></DIV>
<DIV>&nbsp;</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dedwardrhodges1_at_san.rr.com=20
  href=3D"mailto:edwardrhodges1_at_san.rr.com">Edward R. Hodges</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
  title=3Dmeteorite-list_at_meteoritecentral.com=20
  =
href=3D"mailto:meteorite-list_at_meteoritecentral.com">meteorite-list@meteor=
itecentral.com</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, July 24, 2002 =
10:58=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [meteorite-list] =
Cyclic mass=20
  extinction?</DIV>
  <DIV><BR></DIV>
  <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=20
  compiled data on thousands of extinct species and graphed the times of =
their=20
  extinction. In the timeline he created there seemed to be above normal =
rates=20
  of mass extinction every 26 million years. Another scientist is =
working on a=20
  theory that the sun has a companion star, "Nemesis" that perturbs the =
orbit of=20
  comets in the Oort cloud which impact the Earth roughly every 26 =
million=20
  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></BLOCKQUOTE></BODY></HTML>

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Received on Thu 25 Jul 2002 03:17:49 AM PDT


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