Free Republic
Browse · Search
News/Activism
Topics · Post Article

Skip to comments.

Study: Dinosaurs Died Within Hours After Asteroid Hit
University of Colorado News Center ^ | May 24, 2004

Posted on 07/08/2004 12:29:19 AM PDT by LibWhacker

According to new research led by a University of Colorado at Boulder geophysicist, a giant asteroid that hit the coast of Mexico 65 million years ago probably incinerated all the large dinosaurs that were alive at the time in only a few hours, and only those organisms already sheltered in burrows or in water were left alive.

The six-mile-in-diameter asteroid is thought to have hit Chicxulub in the Yucatan, striking with the energy of 100 million megatons of TNT, said chief author and Researcher Doug Robertson of the department of geological sciences and the Cooperative Institute for Research in Environmental Sciences. The "heat pulse" caused by re-entering ejected matter would have reached around the globe, igniting fires and burning up all terrestrial organisms not sheltered in burrows or in water, he said.

A paper on the subject was published by Robertson in the May-June issue of the Bulletin of the Geological Society of America. Co-authors include CU-Boulder Professor Owen Toon, University of Wyoming Professors Malcolm McKenna and Jason Lillegraven and California Academy of Sciences Researcher Sylvia Hope.

"The kinetic energy of the ejected matter would have dissipated as heat in the upper atmosphere during re-entry, enough heat to make the normally blue sky turn red-hot for hours," said Robertson. Scientists have speculated for more than a decade that the entire surface of the Earth below would have been baked by the equivalent of a global oven set on broil.

The evidence of terrestrial ruin is compelling, said Robertson, noting that tiny spheres of melted rock are found in the Cretaceous-Tertiary, or KT, boundary around the globe. The spheres in the clay are remnants of the rocky masses that were vaporized and ejected into sub-orbital trajectories by the impact.

A nearly worldwide clay layer laced with soot and extra-terrestrial iridium also records the impact and global firestorm that followed the impact.

The spheres, the heat pulse and the soot all have been known for some time, but their implications for survival of organisms on land have not been explained well, said Robertson. Many scientists have been curious about how any animal species such as primitive birds, mammals and amphibians managed to survive the global disaster that killed off all the existing dinosaurs.

Robertson and colleagues have provided a new hypothesis for the differential pattern of survival among land vertebrates at the end of the Cretaceous. They have focused on the question of which groups of vertebrates were likely to have been sheltered underground or underwater at the time of the impact.

Their answer closely matches the observed patterns of survival. Pterosaurs and non-avian dinosaurs had no obvious adaptations for burrowing or swimming and became extinct. In contrast, the vertebrates that could burrow in holes or shelter in water -- mammals, birds, crocodilians, snakes, lizards, turtles and amphibians -- for the most part survived.

Terrestrial vertebrates that survived also were exposed to the secondary effects of a radically altered, inhospitable environment. "Future studies of early Paleocene events on land may be illuminated by this new view of the KT catastrophe," said Robertson.


TOPICS: News/Current Events
KEYWORDS: archaeology; asteroid; catastrophism; chicxulub; crevolist; deccantraps; dinosaurs; economic; ggg; godsgravesglyphs; history; theory
Navigation: use the links below to view more comments.
first previous 1-20 ... 121-140141-160161-180 ... 201-211 next last
To: null and void
Did ungulate mammals exist 65 myo? or did they evolve later?

From what I can find, The earliest ungulates go back 90 million years

Some birds do burrow, or take over existing burrows.

Yeah a few, But the vast majority do not and the vast majority of birds seemed to come through with no problem.

Plus even if Alligators and Frogs were underwater during the impact wouldn't they die when they came up to breath?

Many species of frog burrow into the mud and estivate during the summer or drought.

And many do not,

I can see some frogs and possibly some birds making it but all of them? No way!!

No particular reason 'gator eggs wouldn't survive, as you contend some dino eggs did. (KEWL!)

Because whether a gator is a male or female depends on the temperature the eggs are exposed to, So even if they survived the heat blast the global winter afterwards if it didn't kill them outright it would guarantee all gators would be born the same sex, So they would have gone extinct eventually anyhow. 

And I don't contend that, the Geologist (of course) who found the fossils is guessing/wishing it. Geologist tend to make up all kinds of crazy things when they find something that conflicts with the Dino-Asteroid hypothesis (see the "Iridium is missing from the Chicxulub crater itself!!!!" link I posted before, The findings in that report clearly show that whatever happened at Chicxulub has nothing to do with the K-T yet the scientists refuses to even consider the possibility, They even go as far to say so in the paper, and instead they come up with all kinds of crazy explanations)  

But it does bring up a good point in regards to this article, If gator eggs could survive the heat blast why couldn't buried Dino eggs around the world (not just in New Mexico) survive?  

Just a guess - Bottom layer large/or low ejection angle (initial impact) spherules that settled out early. Mid layer turbite marls for the seiches of water sloshing in the Gulf of Mexico basin. Top layer lighter/high ejection angle (carbonate decomposition driven) ejecta.

No, The two spherule layers can not be from the same Asteroid. 

Another picture of the duel sphere layer from the Geological society

Figure 3. El Penon, Mexico. Impact spherule layer at base of siliciclastic deposit is separated by a 15-20 cm thick sandy limestone. J-shaped burrows infilled with spherules are present in the sandy limestone and sandstone unit above. This indicates that both the spherule and sandstone units were deposited over an extended time period that excludes tsunami deposition.

I see most of the data supporting an impact and impact triggered vulcanism as consistent with the pattern of victims and survivors. I don't see anything that doesn't fit the hypothesis.

I see vulcanism being the reason or having a part in the demise of the Dinosaurs and other creatures but not an Asteroid.

Another thing to note is there is increasing evidence that the Chicxulub crater predates the end-Cretaceous mass extinction by about 300,000 years. (More info here and here).

We are clearly operating off subtly different data sets, and have reached differing conclusions. It will be fascinating to see where and how we converge on a consistent understanding.

We will, Once the Asteroid killed the Dinosaurs hypothesis is finally extinct.

Once again, excellent post. This is why I love FR!

You might then enjoy this article http://forteantimesmag.co.uk/articles/111_asteroid.shtml  (Yeah, Yeah , I know what site it comes from but it's the best take on this "Controversy" I've seen)

141 posted on 07/09/2004 3:37:02 PM PDT by qam1 (Tommy Thompson is a Fat-tubby, Fascist)
[ Post Reply | Private Reply | To 126 | View Replies]

To: William Terrell
It's very hard to dispute the evidence that we were clobbered by a very large impactor 65 million years ago, or that the implications for life would have been catastrophic. The only question is how catastrophic. There is no doubt at all that 70% of all species were wiped out.

Personally, when it comes to describing the physical effects of such a collision, such as broiling hot skies, sulphurous emissions, the release of vast quantities of carbon dioxide, etc., I prefer to listen to the physicists and geologists who know something about the subject, and NOT fossilists whose understanding of physics often doesn't even rise to the sophomore level. Their professional jealousy is obvious and rather pitiful; they should not allow it to get in the way of good science, but do.

However, when it comes to describing the fossil record of the extinction, how long it took, which species disappeared, etc., then I admit I would prefer to listen to the palaentologists (to the extent that their version of things does not contradict the hard physical evidence). They make many excellent points it seems to me. But their endless tantrums don't make it easy.

The debate is interesting and important. I just wish palaentologists would stop acting like a bunch of spoiled, pouting, foot-stomping brats. They had their century-long chance -- and then some -- at explaining the extinction of the dinosaurs but never even came close.

142 posted on 07/09/2004 3:59:26 PM PDT by LibWhacker
[ Post Reply | Private Reply | To 139 | View Replies]

To: swilhelm73
And wouldn't that have killed every land plant?

Possible, but if you enter a burned over area a few weeks after a forest fire, you'll see stuff sprouting everywhere; some from buried seed, some from remaining root systems.

143 posted on 07/09/2004 4:11:37 PM PDT by JimRed (Fight election fraud! Volunteer as a local poll watcher, challenger or district official.)
[ Post Reply | Private Reply | To 7 | View Replies]

To: kjam22
40 days and 40 nights?

Not being there,I wouldn't even hazard a guess. :)

If things happened halfway as theorized though,the rain afterward must have been a real toad choker.

144 posted on 07/09/2004 4:20:59 PM PDT by Free Trapper (Because we ate the green mammals first!)
[ Post Reply | Private Reply | To 136 | View Replies]

To: Bloody Sam Roberts

I remember what was said but not who said it. But he appears a lot on Discovery Kids or the kid Dino show.

But his theory is that of virus killing off the dinos not asteroids.


145 posted on 07/09/2004 4:38:48 PM PDT by Michael121 (An old soldier knows truth. Only a Dead Soldier knows peace.)
[ Post Reply | Private Reply | To 140 | View Replies]

To: lelio
Meteor impact table

You might like this link. It uses kinetic energy calculations to determine approximate energy yields for various impacting bodies.

146 posted on 07/09/2004 4:49:46 PM PDT by Centurion2000 (Many a law, many a commandment have I broken, but my word never.)
[ Post Reply | Private Reply | To 22 | View Replies]

To: freebilly
Sure, and the animals that burrowed underground or sheltered in water survived how? By eating what?

By eating roast dinosaur.
147 posted on 07/09/2004 4:58:18 PM PDT by aruanan
[ Post Reply | Private Reply | To 2 | View Replies]

To: LibWhacker
Yes, but the fact is that, like all events and conditions millions of years ago, we have objects that can be seen as evidence and can mean what we think it means. I believe it's a conceit to think we can have anything but a very foggy fringe idea of time periods so long gone and covered, much less which caused what to happen.

They're all entertaining stories and mind puzzles, but there they stop.

148 posted on 07/09/2004 5:08:08 PM PDT by William Terrell (Individuals can exist without government but government can't exist without individuals.)
[ Post Reply | Private Reply | To 142 | View Replies]

To: qam1

Thanks!


149 posted on 07/09/2004 5:13:52 PM PDT by null and void (Why is OUR oil under THEIR sand???)
[ Post Reply | Private Reply | To 141 | View Replies]

To: ZULU
FWIW,there's at least one freshwater turtle that can take in oxygen from the water through it's anus.

I...uh..."kid" you not.

150 posted on 07/09/2004 5:32:13 PM PDT by Free Trapper (Because we ate the green mammals first!)
[ Post Reply | Private Reply | To 124 | View Replies]

To: qam1
If a few of each species survived,the critters that were able to find mates and establish viable breeding populations would have the best chance to multiply.

Flying species could have found others of their kind easier than the landbound.

Just a thought.

151 posted on 07/09/2004 6:07:52 PM PDT by Free Trapper (Because we ate the green mammals first!)
[ Post Reply | Private Reply | To 134 | View Replies]

To: LibWhacker

I'm late to the table. Can someone pass me a serving of
"Bush is to blame".


152 posted on 07/09/2004 6:26:27 PM PDT by TASMANIANRED ( Public Serivce announcement for Kerry supporters::GO CHENEY YOURSELF)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Ichneumon
No he didn't.

That is strange. This is no hallucination.

Somewhere out in the garage, I have an original hardback copy of Immanuel Velikovsky's "Earth in Upheaval" with the Einstein forward. I read it... and have seen the Einstein forward quoted in other places.

Is it a fraud?

Is the report that one of Velikovsky's books was on Einstein's night table an lie?

I am open on the subject.

153 posted on 07/09/2004 6:33:40 PM PDT by Swordmaker (This tagline shut down for renovations and repairs. Re-open June of 2001.)
[ Post Reply | Private Reply | To 95 | View Replies]

To: *Gods, Graves, Glyphs; A.J.Armitage; abner; adam_az; AdmSmith; Alas Babylon!; blam; NukeMan; ...
"According to new research led by a University of Colorado at Boulder geophysicist, a giant asteroid that hit the coast of Mexico 65 million years ago probably incinerated all the large dinosaurs that were alive at the time in only a few hours, and only those organisms already sheltered in burrows or in water were left alive.

The evidence of terrestrial ruin is compelling, said Robertson, noting that tiny spheres of melted rock are found in the Cretaceous-Tertiary, or KT, boundary around the globe. The spheres in the clay are remnants of the rocky masses that were vaporized and ejected into sub-orbital trajectories by the impact. "

Sorry for the late ping.

PING

This is a "Gods, Graves, Glyphs" -- Archeology/Anthropology/Ancient Cultures/Artifacts/Antiquities, etc. PING list.

Please FREEPMAIL me, if you want on or off this list.

154 posted on 07/09/2004 7:21:14 PM PDT by FairOpinion (If you are not voting for Bush, you are voting for the terrorists.)
[ Post Reply | Private Reply | To 1 | View Replies]

To: Swordmaker

Einstein also supported Hapgood.


155 posted on 07/09/2004 7:49:53 PM PDT by RightWhale (Withdraw from the 1967 UN Outer Space Treaty and establish property rights)
[ Post Reply | Private Reply | To 153 | View Replies]

To: FairOpinion

Great stuff, F.O.


156 posted on 07/09/2004 8:53:37 PM PDT by PoorMuttly ("BE Reagan !")
[ Post Reply | Private Reply | To 154 | View Replies]

To: RightWhale
Einstein also supported Hapgood.

Both Velikovsky (alternate solar model) and Hapgood (rapid pole shifts) are looking at evidence that has been swept under the rug and ignored by the mainstream scientists because it doesn't fit their models.

Hapgood and Velikovsky are trying to find a NEW model that does include the excluded evidence without invalidating the orthodox evidence.

157 posted on 07/09/2004 9:25:40 PM PDT by Swordmaker (This tagline shut down for renovations and repairs. Re-open June of 2001.)
[ Post Reply | Private Reply | To 155 | View Replies]

To: qam1; null and void

Thank you for providing some supporting data. I had not yet pawed through my boxes of paleo papers in the garage. Although I am much more familiar with the Tertiary stratigraphy and micropaleontology of California (for instance, the work of Robert Kleinpell and Manley Natland), I have some experience with the K-T boundary as exposed on the west coast. Needless to say, there is nothing particularly dramatic about it - lithologically or paleontologically. As a matter of fact, the boundary is variable and gradational here.


158 posted on 07/09/2004 10:23:28 PM PDT by capitan_refugio
[ Post Reply | Private Reply | To 138 | View Replies]

To: null and void
" See T. Rex and the Crater of Doom."

Could you provide the full reference? I'll see if I can find it.

159 posted on 07/09/2004 10:25:09 PM PDT by capitan_refugio
[ Post Reply | Private Reply | To 119 | View Replies]

To: Aracelis
Musta been one h*lluva bolide

Have you seen the Caloris Basin on Mercury? It is a crater the size of Texas and it fills about one-fourth of an entire hemisphere on Mercury.

4 billion years ago, a 100 kilometer-wide asteroid struck Mercury creating an impact crater that is 1300 kilometers wide. The Caloris Basin, as the crater is called, could hold the entire state of Texas!

Caloris Basin on Mercury
Caloris Basin on Mercury
The Caloris Basin on Mercury

160 posted on 07/09/2004 10:33:29 PM PDT by FreedomCalls (It's the "Statue of Liberty," not the "Statue of Security.")
[ Post Reply | Private Reply | To 10 | View Replies]


Navigation: use the links below to view more comments.
first previous 1-20 ... 121-140141-160161-180 ... 201-211 next last

Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.

Free Republic
Browse · Search
News/Activism
Topics · Post Article

FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson