Skip to comments.Study: Dinosaurs Died Within Hours After Asteroid Hit
Posted on 07/08/2004 12:29:19 AM PDT by LibWhacker
click here to read article
And I thought only Michael Moore could do that!
Foraminifera, very common, sharp discontinuity in the fossil record.
T. rex, known by a few specimens, no clear discontinuity in the record.
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The Man Who Made An Impact
by David H. Levy
I am appreciating Einstein more all the time. He seems to have lent his considerable support to those who think outside the box while staying somewhat near true facts. Einstein himself did that with stupendous success and being thoughtful and reflective apparently knew he did that. He had the confidence that can come with such success to want to encourage others. I still hope we can overcome his Relativity and also improve on his photon.
Sorry I can't link but that should take you to some info on "butt-breathers".Besides the turtle there's a little about dragonfly nymphs and sea cucumbers.
Aracelis,no educated person should be without a firm knowledge of "butt-breathing" turtles,so I pinged you on the slight chance you had missed out in your studies. ;)
Been in and out of the running for a while cause of meds,etc. but having longer lucid periods all the time.
Sniff out post #166.Glad to see you. :o)
You're quite correct...my education was incomplete. :)
I knew this about dragonfly nymphs. I also knew that certain turltes could do this, like the soft-shells (Amyda or Trionyx? They keep changing the genus). That other turtle they mentioned in your article is a new one to me. I never heard of it before. It seems its far better at it than softshells.
Turtles and dragonfly nymphs have a rather sedentary lifestyle. And most turtles use their lungs to breath just like you and me.
I guess Ichthyosaurs and Mosasaurs (which are supposedly closely realyed to modern day monitor lizrds) must have had a far more active lifestyle. At least their body shapes would so indicate.
Indeed, there are many examples of large impact craters. But as you can see from your images of Caloris Basin, this happened a very long time ago, as evidenced by the number of more recent (and much smaller) craters marring the outline of Caloris Basin.
And here is where I become very hesitant to accept the idea of a large bolide impacting and causing the K/T extinction event: by the time the Sinclair dinosaur lumbered across land, most of the large remnants of solar system formation had been swept up by the still-forming planets.
No, I do not discount the possibility that some rogue chunk of matter was still roaming about, however I think the chances of this happening were very, very small. Until more evidence is presented, I will remain quite puzzled.
Our native softshells,spineys in particular,are so active that a little boost to the air supply would be a big plus.
Would be interesting to find out if those giant Asian softshells near extinction have the ability.
Thanks a lot for the help.I caught the deleted code right after posting.It's after 3:00 AM,don't you know. :O)
Yes, and with the reproductive rates of insects and other small animals the main limitation on speed of bounce-back is the recovery of the food plants.
Not seeing the thermodynamic models, it is hard to speculate. However, after talking with some of my colleagues yesterday, the jury is still out with me on this one. If there was this world wide thermal event, there should be evidence in the KT layer suggesting such. Is the carbon ratio in the KT layer synonymous with this type of thermal event? I just don't know. However, there is at least some recent data (albeit scaled down by a very large factor) from the Tunguska event of 1908. The best evidence to date is that a meteor exploded during entry into the Earths atmosphere. Trees were flattened as far away as 30 kilometers due to this explosion prior to surface impact. And interesting side note: There is an increase of Iridium in the local area, not unlike the Iridium found in the KT layer.
Why did the meteor explode prior to impact? It has been proposed that the aerodynamic pressure build up of the atmosphere was greater that the ability of the meteor to remain in one piece. This caused it to explode roughly 10 kilometers above the Earths surface with an estimated energy release similar to a 15 Megaton thermonuclear device. This in effect turned the kinetic energy into heat energy. The forest directly under this fireball was immediately ignited.
The 64-dollar question is would it be possible for a meteor with the mass required for the KT event also create enough of a pressure wave to have a similar breakup? Since there is evidence of a crater (Tunguska has none), this suggests the meteor did not succumb to a total atmospheric breakup (kinetic energy to heat energy). With this in mind, would there be enough ejecta during the reentry releasing kinetic energy to heat coupled with the actual impact to create this worldwide heat pulse?
I have no doubt that it was Bob Bakker from your description and from his theories on the "dino-die-off".
He believes that there are plenty of natural, non-asteroid explanations for the demise of the dinosaurs. Posible viruses and land mass shifts and climatic changes being chief among them.
But his statement about the South American frog as related by you only reinforces my opinion of him as something of a noodle head.
Y'know...so glad that this subject has been raised. Since Muttly was an even littler pup, and found out about this ability in others...he has been jealous.
Consider the possibilities! Eating without having to stop to breathe (a serious Muttly problem), endlessly digging perhaps with a butt snorkel, so for example, Muttly could securely bury his precious secret valuables from other Muttlys, even under and behind this annoyingly flooded flying saucer stuck into this mastodon deep under the birdbath in the back yard....
There was a recent Scientific American article about the near global scale fires started by the ejecta.
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