[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> This is a multi-part message in MIME format. ------=_NextPart_000_0065_01C2336D.F958E680 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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_0065_01C2336D.F958E680 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 6.00.2600.0" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <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 = 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> </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></BODY></HTML> ------=_NextPart_000_0065_01C2336D.F958E680-- Received on Thu 25 Jul 2002 02:58:14 AM PDT |
 StumbleUpon del.icio.us reddit Yahoo MyWeb
|