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rohandsa
 Senior Boarder
Posts: 58 
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Sunday December 17 4:56 PM ET Scientists Drill for Clues to Dinosaur Extinction
By Andrew Quinn
SAN FRANCISCO (Reuters) - Scientists have launched a new project to drill into the gaping crater caused by an ancient asteroid impact, hoping to determine once and for all what led to the global extinction of the dinosaurs millions of years ago.
The asteroid impact near the tip of Mexico's Yucatan peninsula about 65 million years ago has long been believed to be a potential cause for the death of the dinosaurs, which vanished at roughly the same time.
Now scientists are looking at new ways of exploring the vast Chicxulub crater in hopes of discovering how the impact triggered a massive environmental catastrophe that extinguished dinosaur life around the globe.
''It's a 100 million year event
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MANAX99
Senior Boarder
Posts: 46
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The outcome will be of great interest. And I also found the second excerpt, below, fascinating. First, prolonged and severe cold, then abnormal heat for a presumably extended period.
I knew of the nuclear winter scenario, and understand the duration would likely be in the order of a couple of years (is this duration about right?... or do we really know?).
I wasn't aware of this second part, kind of a double whammy. Does anyone have an idea of the duration and magnitude of this green- house effect? This is noteworthy to me because of the greenhouse effect we seem to be getting ourselves into now. Regards, Brett.
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Bluestar
 Senior Boarder
Posts: 63
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Check out this reference, 'Out A Water Lily' at http://www.gi.alaska.edu/ScienceForum/ASF10/1047.html . Back in 1991 paleobotanist Jack A. Wolfe analyzed some fossil water lilies from the latest Cretaceous in Wyoming |
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elas
Senior Boarder
Posts: 51
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From my conversations with Walter Alvarez (admittedly, over two years ago now), there was still a tremendous range among estimates. My guess is that, like any other problem involving the atmosphere, we're not going to know for a long time yet.
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Pierre
Senior Boarder
Posts: 55
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Scientists Drill for Clues to Dinosaur Extinction
By Andrew Quinn
SAN FRANCISCO (Reuters) - Scientists have launched a new project to drill into the gaping crater caused by an ancient asteroid impact, hoping to determine once and for all what led to the global extinction of the dinosaurs millions of years ago.
'Gaping crater'? Reuters does it again. The crater gapes so enormously that people walked all over it, flew over it, and did all sorts of other things around it for thousands of years (well, not the flying part) without even noticing it. 65 mya it gaped, no doubt!
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gsbisht1
Senior Boarder
Posts: 67
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Don't be such a perfectionist !! It does gape . . . 2, 500 feet below the surface. Sensationalist muck-rakers have to have some fun.
John M.
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