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Palaeontology

Mass extinctions 'every 27m years'

By T.K. Randall
July 14, 2010 · Comment icon 21 comments

Image Credit: NASA
According to palaeontologists a mass extinction event occurs on Earth every 27 million years.
For at least the last 500 million years, say Adrian Melott, an astrophysicist at the University of Kansas, and Richard Bambach, a palaeontologist at the Smithsonian Institute, there has been a burst of extinctions every 27 million years.


Source: Telegraph | Comments (21)




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Recent comments on this story
Comment icon #12 Posted by Malakthrin 14 years ago
There is nothing in the fossil record or our knowledge of evolutionary biology that allows for an advanced civilization in earth ancient history. Its just not there. Or we just haven't found it yet. *shrug* We've found what? 250,000 species through fossil records? Compared to the probably millions of species that have existed over the aeons, it's possible there has been 'advanced' lifeforms here before. Likely? Probably not. Impossible? Certainly not. 98% of species that ever lived are extinct.
Comment icon #13 Posted by danielost 14 years ago
Or we just haven't found it yet. *shrug* We've found what? 250,000 species through fossil records? Compared to the probably millions of species that have existed over the aeons, it's possible there has been 'advanced' lifeforms here before. Likely? Probably not. Impossible? Certainly not. 98% of species that ever lived are extinct. dont confuse the issue, it isnt in the fossil record so it cant be there. (i am being sarcastic here) the earliest known country was sumer until they found another one off the coast if india. oh and except for power pumps they had running water like we do.
Comment icon #14 Posted by 27vet 14 years ago
Maybe that is what Atlantis was.
Comment icon #15 Posted by danielost 14 years ago
Maybe that is what Atlantis was. i think so and have said i have thought so. basically based on the fact that they were supposed to be masters of the air.
Comment icon #16 Posted by Abramelin 14 years ago
i think so and have said i have thought so. basically based on the fact that they were supposed to be masters of the air. Yep, master breathers they were. Puff themselves up, and make themselves look bigger than anyone would have ever thought possible.
Comment icon #17 Posted by danielost 14 years ago
Yep, master breathers they were. Puff themselves up, and make themselves look bigger than anyone would have ever thought possible. well masters of the air means they either controlled the air or flew.
Comment icon #18 Posted by SRCivic98 14 years ago
The difference is technology. With technology we can prevent some of these things from happening. It's just a matter of doing it in time. IMO the sky is falling right now and unfortunately most won't believe it until a piece of it hits them. Too many people see money, fame, power and objects as their gods. A small example: People are so worried about getting their cars dirty (a big hunk of metal) that they value it over littering. Instead of throwing a wrapper out your car window, keep a small bag for trash under your seat. Then, once a week, throw that bag in a receptacle. This is just one of... [More]
Comment icon #19 Posted by J.B. 14 years ago
And this is why we prioritize. 1. Minimize our impact as best we can on nature. 2. fix that damn greed thing that makes us want to rape and pillage the environment/each other. 3. Space travel/colonization. More planets we have under our belt, the stronger our chances of survival in the long run are.And any species we take along will benefit too, not to mention continual evolution that will eventually generate so many different off-shoots of species that if one goes extinct there could be two or three replacement species on hand.
Comment icon #20 Posted by Abramelin 14 years ago
well masters of the air means they either controlled the air or flew. I was joking. You were joking too, right? .
Comment icon #21 Posted by danielost 14 years ago
I was joking. You were joking too, right? . everything but them being masters of the air.


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