Hi Sarah And List I don't know that it hasn't been found in S.A. But South America is the stomping grounds for some top level geologists of many fields, not just paleo. But I do know that the layers in which bone is found has been correlated to those found elsewhere. The problem with an impactor causing a global kill off of dinosaurs is the lack of good evidence. With the exception of this finding in New Mexico, all others to date have proved to be reworked bones, and the New Mexico may well prove in the long run to be so as well. My background is geology (last year at Western Washington University for a bac) and I have followed the dinosaur extinctions for some time now. My personal feeling is that one day, it will all fall together and be seen that mammals will be found to be, once again, the bane of ground nesting animals that lay eggs. This was true for the terror birds of South America and my gut instinct is that it will also be found to be the problem with the dinosaur decline. I feel that egg nests need to be really closely examined for mammal teeth and marks (a hard enough task in itself since they are very small , like the size of a pin head in the early Cretaceous). Not trying to take away from an impactor which, evidence does seem to support, wiped out a very large amount of marine life forms as well as terrestrial life, but birds survived, and thats a crucial item not to be overlooked in a planet killer, since birds are one of the easier forms to kill. And a global covering of acid rain, as suggested, would have harmed birds very easily. It could be that birds (coelursaurs ) could also have had a part in the extinction of dinosaurs. Lots to speculate on, little evidence to date. But, plenty of people who are interested, so one day, I feel there will be some answers, not all, but some. Mark
----- Original Message ----- From: Jensan Scientifics/ Sci-Mall <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, January 21, 2003 6:41 PM Subject: Re: [meteorite-list] Dinosaurs Experienced Climate Changes Before K-T Collision > Hi Mark, > > You do seem to know alot about science. I do not know what your > background is... but maybe you would enlighten me? > > I am curious as to why there has been no K/T found in South America. > > Is it just that they do not have good geologists, or no one just hasn't > figured it out yet. > > Sarah > > Jensan Scientifics/ Science Mall > > [EMAIL PROTECTED] wrote: > > > > HI List > > > > This is exactly why the findings in New Mexico are a problem. In the past, > > when bones had been found at and above the K-T Boundary layer, they have, > > after much analysis, been found to be "reworked" meaning they were deposited > > there after being exposed and moved from somewhere else. These bones in New > > Mexico will most likely prove to be the same, and not deposited at the time > > of impact as claimed. I believe (I haven't recieved an answer from the > > author yet) that the fossils will be found to be mixed, dis-articulated and > > not an indication for extinction as claimed by the press. > > But this still needs to be checked in the paper itself as the abstract is > > far to vague and what the abstract covered was the chrono tags for the > > sandstone/K-T layer, not the fossils themselves. > > Mark > > > > ----- Original Message ----- > > From: E.P. Grondine <[EMAIL PROTECTED]> > > To: <[EMAIL PROTECTED]> > > Sent: Tuesday, January 21, 2003 12:07 PM > > Subject: Re: [meteorite-list] Dinosaurs Experienced Climate Changes Before > > K-T Collision > > > > > Hi - > > > > > > the acid rain generated by the compounds from the > > > soils in the area where the largest chunk hit - > > > Chixulub (sp?) > > > > > > of course, the first thing which happened is that all > > > surface animals with lungs had them ruptured by the > > > blast wave - and then you had global fires, another > > > source of compounds for acid or caustic rains - > > > > > > fossilization requires an undisturbed "quiet: > > > environment - and its not likely that anything like > > > that existed anywhere on the Earth after this series > > > of comet fragments impacted - > > > > > > best wishes - > > > ep > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > --- [EMAIL PROTECTED] wrote: > > > > What acid rain do you refer to? This is an impactor, > > > > not a volcanic > > > > eruption. Acid rain would have to be supplied with > > > > large quantities of > > > > nitrous and sulfuric compounds in order to cause any > > > > damage. So far as I > > > > know, no significant (if any) acid spikes are noted > > > > from any deep ice > > > > corings for any recent impact event (last 30,000 > > > > yrs) so this is not a > > > > reason for lack of dinosaur (note that I have never > > > > mentioned any other type > > > > of fossil bone) fossils close to the K-T Boundary. > > > > Mark > > > > ----- Original Message ----- > > > > From: E.P. Grondine <[EMAIL PROTECTED]> > > > > To: <[EMAIL PROTECTED]> > > > > Sent: Thursday, January 16, 2003 12:50 PM > > > > Subject: Re: [meteorite-list] Dinosaurs Experienced > > > > Climate Changes Before > > > > K-T Collision > > > > > > > > > > > > > The bones would not have survived the acid rain > > > > long > > > > > enough to be fossilized. Same goes for bones in > > > > the > > > > > process of fossilization. > > > > > > > > > > ep > > > > > > > > > > > > > > > --- [EMAIL PROTECTED] wrote: > > > > > > 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 > > > > > > > > > > > > > > > __________________________________________________ > > > > > Do you Yahoo!? > > > > > Yahoo! Mail Plus - Powerful. Affordable. Sign up > > > > now. > > > > > http://mailplus.yahoo.com > > > > > > > > > > ______________________________________________ > > > > > 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 > > > > > > > > > __________________________________________________ > > > Do you Yahoo!? > > > Yahoo! Mail Plus - Powerful. Affordable. Sign up now. > > > http://mailplus.yahoo.com > > > > > > > ______________________________________________ > > 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
