[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> This is a multi-part message in MIME format. ------=_NextPart_000_0061_01C23368.53D3CCC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ------=_NextPart_000_0061_01C23368.53D3CCC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 5.50.4134.600" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT size=3D4>Hi Edward and List,</FONT></DIV> <DIV><FONT size=3D4></FONT> </DIV> <DIV><FONT size=3D4>I took a course in college called Catastrophes and = Mass=20 Extinctions. Our "textbook" was called "Nemesis the Death Star and = Other=20 Theories of Mass Extinction." 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> </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> </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> </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"> 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> </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> </DIV></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_0061_01C23368.53D3CCC0-- Received on Thu 25 Jul 2002 03:17:49 AM PDT |
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