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[探索发现] 【整理】2010-02-19 地球的起源 EarthMade—9

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本帖最后由 nobody00 于 2010-2-19 11:55 编辑

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Nick Drake gets word that in 2009, archaeologists have made an important discovery that supports the river theory. Stone tools are found not far from the site of the mega lake in Tunisia.

The first step is to identify the shoreline of the ancient lake.

“ah, now, this, this looks good. So, we got some freshwater mollusks.”

These tiny shells are good signs of the lake. Now, he searches for what may have been drinking the water when the mega lake existed.

“we have what looks like part of a jawbone of a small herbivore. You can see three teeth running along here, some sort of gazelle.”


So, animals must have been existed here in the desert when it was green.

“I guess, we got a stone tool here. It has become blunted, and they’re retouched with a lot of very fine flakes off edge. The fact we got stone tools and we’ve got dead animals suggest hunting. And this was the animals that was being hunted. And then we have water, so people sitting around a water hole, waiting for animals to come to drink and then killing them, eating them behind.”

It’s an important find. A stone age tool shows people lived on the shore of this ancient lake, and 90,000 years ago was a turning point, not just in the story of the Sahara, but in the history of humanity itself.
We are all descended from one group of people in east Africa, the birthplace of humankind. Sometime between 80,000 and 120,000 years ago, modern humans started the long journey out of Africa. No one knows, for certain, what route they took.

The prevailing view is that the Sahara was impassible, so human left east Africa and traveled to the coast, then crossed a land bridge into the Arabian Peninsula.
But Drake suspects that if the mega lakes were fed up by a river system it would have created a green corridor across the burning sands.

So, our ancestors could have follow this river system, gone round the lakes, followed the next river system around the next lake and the next river system on the last lake, and then they'd be in north Africa, and it would be simple for them to just move out. The lake is a good story. The rivers plus the lake is a very concrete story.

To find proof of his theory, Drake heads to one of the few areas in the desert where water still flows--an oasis.
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