Thanks decimon.
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Posted on 10/10/2011 7:01:06 AM PDT by decimon
Results contradict several theories for cause of extinction
KINGSTON, R.I. -- October 10, 2011 -- While the cause of the mass extinction that occurred between the Permian and Triassic periods is still uncertain, two University of Rhode Island researchers collected data that show that terrestrial biodiversity recovered much faster than previously thought, potentially contradicting several theories for the cause of the extinction.
David Fastovsky, URI professor of geosciences, and graduate student David Tarailo found that terrestrial biodiversity recovered in about 5 million years, compared to the 15- to 30-million year recovery period that earlier studies had estimated. The recovery period in the marine environment is believed to have taken 4 to 10 million years, about twice as long as the recovery period after most other mass extinctions.
(Excerpt) Read more at eurekalert.org ...
Permeable ping.
How long before the young earthers show up here?
If I only had a dollar for every time I've said that.
You go first, then! I’m a Holocene guy myself.
I’m a late Holocene kinda guy m’self.
shocking what kind of stuff is going on at the URI campus.
How long is a light year?
Has it always been thus?
How do you know?
What if the speed of light is not a constant?
What do we do when our "yardstick" may be suspect?
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| GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach | |
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Thanks decimon. |
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Scientists Find Signs of Meteor Crash That Led to Extinctions in Era Before DinosaursDr. Becker, Dr. Poreda and their colleagues had previously found buckyballs at an impact crater in Sudbury, Canada, and in two meteorites. They have also found buckyballs containing similar types of gases in sediments dating from the dinosaur extinctions.
by Kenneth Chang
February 23, 2001
In the experiments, the scientists extracted buckyballs -- not just the typical sphere consisting of 60 carbon atoms, but also larger versions with up to 160 atoms -- from the sediments with organic solvents.
They then opened the buckyballs to release the helium and argon inside them. The nuclei of most helium atoms consist of two protons and two neutrons. A few -- one out of 700,000 helium atoms in the atmosphere -- are a lighter version, with only one neutron. For the helium in the buckyballs, a much larger fraction -- one out of 5,000 -- was the lighter version, similar to the ratio produced by fusion in stars.
The argon indicated a similar story, with low concentrations of a version that is commonly produced on Earth from the radioactive decay of potassium.
"I think the argon isotope ratio measurement is very convincing," said Dr. Kenneth A. Farley, a professor of geochemistry at the California Institute of Technology. "That's very hard to understand if it's not extraterrestrial."
Asteroid ‘destroyed life 250m years ago’
http://www.freerepublic.com/focus/chat/2084610/posts
I’d take a nickle.
The Permians had no idea what was about to hit them . . .
LOL!
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