Mark: This is not entirely true. This is location dependent, for example in New Mexico (San Juan Basin) you can find them right below (inches below the Ir anomaly..which is "off the scale") and ABOVE the K-T boundary. Yes, I said "above" the impact layer. This has been an enigma, but Jim Fassett (USGS) has provided some compelling evidence (in the form of geochemistry) that the hadrosaur femur he found, was NOT remowrked from sediments below. He termed these survivors "Lazarus" dinosaurs and speculated they may have survived well into the Paleocene. Jim is giving a talk here in Denver sometime in April. <http://www.dinoridge.org/activity.htm>
Something to think about... Matt Morgan -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Wednesday, January 15, 2003 10:54 AM To: Ron Baalke Cc: [EMAIL PROTECTED] Subject: Re: [meteorite-list] Dinosaurs Experienced Climate Changes Before K-T Collision Hi Ron and list The fact is that dinosaur fossils are not found at the k-T boundary. One has to go 9-10 ft at best, below the boundary to find dinosaur bones in any of the beds that contain dinosaur fossils. This represents a substantial period of time prior to the impact layer. This is why it is argued against. No one has yet to find dinosaur bones at or immediately below the boundary. Mark ----- Original Message ----- From: Ron Baalke <[EMAIL PROTECTED]> To: Meteorite Mailing List <[EMAIL PROTECTED]> Sent: Wednesday, January 15, 2003 8:41 AM Subject: Re: [meteorite-list] Dinosaurs Experienced Climate Changes Before K-T Collision > > > > I have read many of the popular theories on the extinction events argued in > > this message, and to be frank, the fact remains that dinosaurs, in general, > > were on the decline. > > The dinosaurs may have well been on gradual decline prior to the impact, but > even if that is the case, that does not contradict their abrupt > disappearance at the time of impact. > > > As far as an impacter causing the extinction. I'm > > skeptical, for then, how do the mammals, marsupials, and birds, all > > non-burrowing, survive a "world affecting" impact. > > I don't find it strange at all that the large animal species at the top > of the food chain (ie: dinosaurs) were the most adversely affected by the impact. > The smaller species or the more mobile (mammals, birds, reptiles, etc.) had a > better chance of survival in the aftermath. A large number of the smaller animals > did go extinct as well at the time of the impact, but some were able to survive. > > Ron Baalke > > ______________________________________________ > Meteorite-list mailing list > [EMAIL PROTECTED] > http://www.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
