Posted on 05/21/2007 10:16:48 PM PDT by TigerLikesRooster
Catastrophic Comet Chilled and Killed Ice Age Beasts
Jeanna Bryner
LiveScience Staff Writer
LiveScience.com
Mon May 21, 9:30 AM ET
An extraterrestrial object with a three-mile girth might have exploded over southern Canada nearly 13,000 years ago, wiping out an ancient Stone Age culture as well as megafauna like mastodons and mammoths.
The blast could be to blame for a major cold spell called the Younger Dryas that occurred at the end of the Pleistocene Epoch, a period of time spanning from about 1.8 million years ago to 11,500 years ago.
Research, presented today at a meeting of the American Geophysical Union (AGU) in Acapulco, Mexico, could shed light on major questions about the megafauna extinction, the disappearance of the Clovis people, and an abrupt climate change.
“Based on the distribution of material, it looks like this impact probably occurred in southern Canada near the Great Lakes, over what at that time would have been a major glacier, the Laurentide ice sheet,” said one of the presenters, Richard Firestone of Lawrence Berkeley National Laboratory.
Comet chemistry
They couldn’t find a distinct crater, suggesting the comet burst in the air rather than slamming into Earth. Even an airburst should leave its mark, so the scientists think the Laurentide Ice Sheet absorbed much of the impact.
A much smaller object burst in the air over Siberia in 1908, flattening 800 square miles of forest
Firestone and his colleagues investigated buried carbon-rich layers dating back 12,900 years and blanketing more than 50 areas that span from California through Canada and into Belgium. They found a slew of extraterrestrial markers, including nanodiamonds, which are formed by energetic explosions in space, elevated amounts of the rare element iridium and tiny capsules of glass-like carbon.
“Glass-like carbon is essentially carbon that’s been melted at very high temperatures,” like those from a comet impact, Firestone explained. They also found elevated levels of the rare Earth element iridium that are too high to be from Earth.
Mega die-off
During the last catastrophic animal extinction, more than three-fourths of the large Ice Age animals, including woolly mammoths, mastodons, saber-toothed tigers and giant bears, died out. Scientists have debated for years over the cause of the extinction, with both of the major hypotheses—human overhunting and climate change—insufficient to account for the mega die-off.
An extraterrestrial explosion could have triggered a wave of massive wildfires that reduced to ashes the mastodons of the day, say the scientists. At one site called Murray Springs in Arizona, a well-known Clovis site, the scientists found megafauna covered by the comet debris.
“This black mat drapes over the bones of partially butchered mammoths as if somebody was in the process of working on these animals while they were actually killed,” Firestone told LiveScience in a telephone interview. “And between this black mat and the bones of this mammoth we find this ejecta layer. So it’s as if the [impact] event occurred right on top of these mammoth bones and then this black mat occurs on top of that.”
Once put out, the fires would have left a barren landscape devoid of food for any remaining animals.
“I would argue that most of the megafauna either died or starved after this thing,” Firestone said. “But certainly there must’ve been pockets of survival of large animals even mammoths that may have survived for thousands of years beyond that, ultimately to be hunted to death or whatever happened to them.”
Chill out
The comet theory could also explain the abrupt plunge in temperatures during the Younger Dryas period. Presenters at this AGU symposium argue that the comet impact or explosion would have heated up the area, causing the Laurentide Ice Sheet to melt and send massive amounts of water into the Atlantic Ocean. The input would affect ocean currents, which are responsible for keeping the atmosphere at livable temperatures.
Plus, the massive wildfires would have loaded the atmosphere with Sun-blocking dust, soot, water vapor and nitric oxides. The result would be the abrupt climate cooling.
The evidence for a comet impact is substantial.
“I think the fact that there’s an impact is pretty definite. There are too many markers there for it all to be coincidence or happenstance explanations,” Firestone said, adding, “What will be debated is whether the extent of the impact was sufficient for instance to kill all of the megafauna or whether other factors were also equally important.”
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Ok, I won't.
Now, please do not make blanket assumptions about me.
Do the geometry:
The 'atmosphere' surrounding a ~4000 radius Earth is REAL thin!
About the 'shallowest' angle you can get is and Earth grazer - a path around 200 miles long maximum thru the stratosphere and troposphere.
You'd get a 200 mile long, 3 mile wide path of STUFF.
No then; just how much 'damage' does that appear able of creating?
I did not. I formed a hypothesis and checked it by asking you. Otherwise I would have dismissed you without learning anything.
Of course, there’s no need to go into the Great Deception of the NASA program.
Everyone knows that’s really a super secret operation to have SUVs placed all over the other planets in the solar system along with monstrous bags of gasoline and huge piles of oxygen tanks.
The plan, dastardly eeveel plan to pollute every planet that nasty humans can reach, take AWG to the whole solar system and artificially deplete our planetary supply of gasoline and oxygen.
It wasn’t me... although come to think of it, I may have done that once upon a time... but I think I only considered it until I found someone else had. So really, I’ve got nothin’...
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