West's most ancient writing?

PHILADELPHIA — Weathered and pitted with the passage of 3,000 years, a rock slab found in southern Mexico shows clear evidence of a script that anthropologists say is the oldest writing ever found in the Western Hemisphere.

In Friday's issue of the journal Science, researchers identified the carved symbols as those of the Olmec civilization, an urbanized people who lived along the Mexican Gulf Coast from about 1200 B.C to 400 B.C.

Deciphering the mysterious script, which includes apparent depictions of fish, maize, dart tips and insects, will be a big challenge even if other examples of it can be found. But the discovery nevertheless provides fascinating new clues about the first complex civilization in this part of the world — a society of kings and priests that is poorly understood.

"This find knocked us off our feet," said Brown University anthropology professor Stephen D. Houston, who helped Mexican experts analyze the find. "Writing systems of the ancient world are discovered once in a lifetime."

The 26-pound slab was discovered accidentally in April 1999, in a town called Lomas de Tacamichapa. Road workers unearthed the tablet and other artifacts in a gravel quarry that was both a source of building materials and a known archaeological site. Although archeologists were not able to view the objects in the positions they were found, the researchers said there is no doubt of their authenticity.

That belief was echoed by Simon Martin, a University of Pennsylvania expert in Mayan writing who was not involved with the research.

After the discovery, local authorities asked the National Institute of Anthropology and History in Mexico to investigate.

Married Mexican archaeologists Maria del Carmen Rodriguez Martinez and Ponciano Ortiz Ceballos were the first researchers to study the block and other objects, including ceramic pieces, clay figurine fragments, and ground stone artifacts. Though similar symbols have been found on other Olmec artifacts, the paper's authors called the new find the first unambiguous example of Olmec text.

The style of the accompanying artifacts led Rodriguez and Ortiz to estimate that the block had been carved sometime between 1000 to 800 B.C. They were the lead authors of the paper.

The next oldest Mesoamerican writing to be found probably dates from about 500 B.C., although experts disagree, Houston said.

The new block features 28 distinct symbols, some of them repeated several times in various combinations, for a total of 62 markings.