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News: Scientists Confirm Historic Massive Flood in Climate Change
http://www.giss.nasa.gov/research/news/20060228/
 
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THE SAHARA

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Author Topic: THE SAHARA  (Read 4731 times)
Bianca
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« Reply #30 on: May 17, 2009, 09:02:26 am »








We all pitch in, searching more walls for pictographs.

Excitement abounds when new images are spotted.

“Maria, I have what might be a hippo here,” Brooks calls out. “Not much of its head, but the body....”

Gaugnin extricates herself from a tight cave corner and bounds over. “No, the legs are far too long,”
she sighs. “It looks more like a gazelle with a fat rump.”



 
Ostriches  near Wadi Ternit  may have appeared 5500 to 6000 years ago, and are also among the
fauna that is depicted in the area’s rock art. 


Next to the shelter with the white rhino image, Gaugnin has spotted a collapsed rock shelter with more rock paintings.

That gives her an idea: If the approximate date of the collapse could be determined, it would provide at least an end date—a date after which the painting must have been made.

Mather concurs.

“Let’s take a sample from the broken edge,” she says. “Here, this one follows the bedding plane.”

Clink, clink goes the hammer as a fist-sized chunk of sandstone and pyroxene falls loose. “We’ll use cosmogenic dating on this one,” she says, marking today’s date and GPS coordinates on the sample
with a felt pen.

Such are the trials and perils of dating western Saharan climate change.

It’s not as easy as picking up soil or rock samples and sending them off to the lab and waiting for the answer. It’s fraught with approximations, relative dates, post hoc dates, cross-checks and correlations.
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Your mind understands what you have been taught; your heart what is true.
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