Oxytropidoceras Posted March 28, 2013 Share Posted March 28, 2013 New Evidence Ancient Asteroid Caused Global Firestorm On Earth, Science Daily, March 27, 2013, http://www.sciencedaily.com/releases/2013/03/130327144249.htm and http://phys.org/news/2013-03-evidence-ancient-asteroid-global-firestorm.html The paper is: Robertson, D. S., W. M. Lewis, P. M. Sheehan, and O. B. Toon, 2013, K-Pg extinction: Reevaluation of the heat-fire hypothesis. Journal of Geophysical Research: Biogeosciences. Early View (Online Version of Record published before inclusion in an issue) http://onlinelibrary.wiley.com/doi/10.1002/jgrg.20018/abstract Yours, Paul H. Link to comment Share on other sites More sharing options...
Shamalama Posted March 28, 2013 Share Posted March 28, 2013 Just doesn't sound the same as K-T boundary. -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/ Link to comment Share on other sites More sharing options...
Auspex Posted March 28, 2013 Share Posted March 28, 2013 "The conditions leading to the global firestorm were set up by thevaporization of rock following the impact, which condensed intosand-grain-sized spheres as they rose above the atmosphere. As theejected material re-entered Earth's atmosphere, it dumped enough heat inthe upper atmosphere to trigger an infrared "heat pulse" so hot itcaused the sky to glow red for several hours, even though part of theradiation was blocked from Earth by the falling material..." How plausible is this 'condensation' idea, and would the reentry velocity have been high enough to create such levels of heat? "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Shamalama Posted March 29, 2013 Share Posted March 29, 2013 Would it not be so much be from reentry as from the heat of impact? i.e. red hot chunks of glass landing in forests? -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/ Link to comment Share on other sites More sharing options...
Auspex Posted March 29, 2013 Share Posted March 29, 2013 Would it not be so much be from reentry as from the heat of impact? i.e. red hot chunks of glass landing in forests? Relatively locally, that might happen, but they're trying to explain global incineration. It seems unlikely, to me, that ejecta thrown half-way around the world would still be red-hot (sub-orbital space is pretty cold!). "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
xonenine Posted March 29, 2013 Share Posted March 29, 2013 seems more likely dust and trapped heat would create some kind of pulse, I'd like to read the whole paper "Your serpent of Egypt is bred now of your mud by the operation of your sun; so is your crocodile." Lepidus Link to comment Share on other sites More sharing options...
Auspex Posted March 29, 2013 Share Posted March 29, 2013 I'd like to see all their supporting evidence... Right now, everything rests on the hypothesis presented to expose causality of a suggested global incineration. The proofs put forward so far seem to me to be highly circumstantial. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
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