Posted on 03/27/2002 6:14:08 AM PST by blam
Footprints and a fire found from 20,000 years ago
27 March 2002
PHILIP BALL
Humans were living in the Tibeatan mountains 16,000 years earlier than scientists had thought.
© Bill Bachmann/Alamy
Handprints and footprints 20,000 years old reveal that people lived on the Tibetan plateau at the height of the Ice Age - 16,000 years earlier than scientists had thought. The newly found signs of life cast doubt on the idea that a glacier a kilometre thick covered the plateau at that time.
David Zhang and S. H. Li of the University of Hong Kong found the marks of at least six individuals, including two children, in marble-like rocks that were once soft mud on a mountain slope 85 kilometres from the Tibetan capital, Lhasa1.
They also found a fireplace nearby, with the remains of a primitive stove, suggesting that the site was a camp, perhaps even a settlement.
Until now, the oldest known settlements on the Tibetan plateau dated from late Neolithic times, around 4,000 years ago. This had led some researchers to conclude that humans first migrated into Tibet around this time.
The encampment is also a nail in the coffin for the ice-covered plateau hypothesis. It indicates that at least part of the plateau, which today is 4,000 metres high on average, was free of ice even during this frigid period of Earth's history.
Carbonate cast
The very hot spring that probably attracted the Ice-Age settlers also preserved their marks for posterity. The spring water is rich in dissolved minerals and gases. As carbon dioxide gas bubbles out of the water, minerals such as calcite precipitate out. This forms a soft mineral mud. As the mud dries, it turns into a hard, durable limestone called travertine.
So, thanks to the hot spring, the mountainside made plaster casts of the Ice-Age people who lived on it. Nineteen hand- and footprints are clearly visible in the stone surface.
Zhang and Li date the travertine deposit by the tiny grains of quartz that got trapped within it while the mud solidified. Quartz acts as a mineral clock. When heated, it emits light in proportion to the time that has elapsed since it was last warmed or exposed to sunlight.
This technique is called thermoluminescence dating. Energy builds up in trapped quartz because it is exposed to radiation from natural radioactive elements such as uranium and thorium in surrounding minerals. It emits this energy as light: the longer the exposure time, the higher the energy and so the brighter the light.
Because heat or sunlight releases the trapped energy, the quartz grain clock would have been set to zero when the grains became embedded in the warm mud from the spring.
References Zhang, D.D. & Li, S. H.Optical dating of Tibetan human hand- and footprints: an implication for the palaeoenvironment of the last glaciation of the Tibetan Plateau. Geophysical Research Letters, 29, Published online DOI: 10.1029/2001GL013749 (2002).
© Nature News Service / Macmillan Magazines Ltd 2002
I agree. South America will eventually cause everything we think we now know to be thrown out the door.
Yup. There's a 30k year old human site there somewhere. The name slips my memory presently.
There is an atmospheric phenomenon we call loess here in interior Alaska. It is fine airborne silt that forms surprisingly quick deposits on everything even when there is no wind. The same day you wash your car, you will find a layer of gritty dust on it, hard stuff that can scratch paint and glass. In the course of a few years loess covers everything. Something from 30,000 years ago would be buried, but some sites can be found simply by looking at the terrain and thinking --this would be a good site for a hunting camp or hunting lookout post. Then dig. Who knows, you might find a tooth and then you can get your doctorate.
I think it was a cave. I'll alert you when I come across it (the article) again.
However my son spent 2 months in Tibet just about a year ago exactly...he found it absolutely beautiful there and the Tibetan people to be the friendliest hes every met...the drawback to visiting Tibet today, tho, is the constant presence of the Chinese military and Chinese police...
And probably sat around the campfire telling stories of the great hunter Ronald Reaganstone.
This topic was posted , thanks blam.
20 years ago.
Twenty years plus 15 days!
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