john hawks weblog

paleoanthropology, genetics and evolution

Toumai in the hotseat

Mon, 2008-09-01 21:41 -- John Hawks

Hey, I never said it was a vulgar ape...

A fresh storm has broken out over an ancient fossil presented by its defenders as a forebear of humanity and dismissed by its critics as the remains of a vulgar chimp. Controversy has swirled around Toumai, the name given to the nearly-complete skull, ever since it was found in the Chadian desert in 2001.

...

But the man who discovered Toumai, Alain Beauvilain, of the University of Paris at Nanterre, has now publicly challenged [its 7-million-year-old date] estimate.

This really isn't a very well-written story (it refers to "carbon dating" the remains, for instance). I suppose that if Beauvilain is correct, the true date should likely be younger, but that doesn't really affect anyone's interpretation of the skull. The only practical effect: If we were to assume it's a hominin (which I don't), then a younger date would reduce the apparent discrepancy with the relatively recent genetic divergence between hominins and chimpanzees.

Neandertals

For years, I've worked on their bones. Now I'm working on their genes. Read more about the science studying these ancient people.

Denisova

From a finger bone of an ancient human came the record of a completely unexpected population. My lab is working on the science of the Denisova genome.

Acceleration

The advent of agriculture caused natural selection to speed up greatly in humans. We're uncovering some of the ways that populations have rapidly changed during the last 10,000 years.

Malapa

Just outside Johannesburg, the Malapa site is producing some of the most exciting finds in human evolution. This site is the headquarters of the Malapa Soft Tissue Project.