Posted on Friday 24 October 2003

Here's another article about the 160,000 year old skeletons recently unearthed in Ethiopia.

The discovery was largely an accident, one that never would have happened if not for El Nino. Back in 1997, the Pacific Ocean disturbance that affects much of the world's weather triggered punishing rains in Ethiopia. The deluges not only exposed buried fossils but also drove away the people of Herto and their livestock, which would have trampled the fragile bones. When White and the others happened to drive by the village, they noticed a fossil hippo skull poking out of the ancient sand. On closer examination, the skull bore marks indicating that the animal had been gashed with a stone tool. Clearly, human ancestors had once lived there.

When the scientists returned 11 days later, it took them only minutes to find the skulls of two adults, probably male. Six days after that, Berhane Asfaw of Ethiopia's Rift Valley Research Service found a third, the skull of a 6-or 7-year-old child, shattered into about 200 pieces. After years of painstaking cleaning, reassembly and study, the team was confident enough to tell the world that it had found the earliest true Homo sapiens — older by at least 1,000 generations than anything previously discovered. "It's not a modern human," says White, "but it's so close that there's no doubt it will become one. The child, in particular, is so like us that you couldn't distinguish it in a population of modern human children." White and his colleagues think these hominids are distinctive enough to merit their own subspecies, which the team has dubbed Homo sapiens idaltu. (Idaltu means elder in the Afar language.) But whether or not the nomenclature holds up, says paleoanthropologist G. Philip Rightmire of the State University of New York at Binghamton, "the key point is that they are from the right place at the right time to be, broadly speaking, the ancestor of modern people. It's as near as we're going to get."


...Perhaps the most intriguing discovery, however, is that these ancestors behaved like us in at least one poignant way: all three skulls were deliberately tampered with after death, evidently as part of some sort of mortuary practice. "This," says White, "is the earliest evidence of hominids continuing to handle skulls long after the individual died."

"Handle" is an understatement. Cut marks on the skulls indicate that the overlying skin, muscles, nerves and blood vessels were removed, probably with an obsidian flake. Then a stone tool was scraped back and forth, creating faint clusters of parallel lines. The modification of the child's skull is even more dramatic. The lower jaw was detached, and soft tissues at the base of the head were cut away, leaving fine, deep cut marks. Portions of the skull were smoothed and polished.

"The cut marks aren't a classic sign of cannibalism," White said while showing the skulls to a TIME reporter in Addis Ababa. "If you wanted to get at the brain in order to eat it, you'd just smash open the skull." Instead, he suspects, the scratches might be a form of decoration. As for the polished areas, he says, "we know they weren't caused by the environment, because the marks go across the breaks between the recovered pieces. The child's skull looks as though it has been fondled repeatedly."

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