Ancient Mound Builders Get Cultured

By Bower, Bruce | Science News, September 20, 1997 | Go to article overview
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Ancient Mound Builders Get Cultured

Bower, Bruce, Science News

Clusters of earthen mounds containing evidence of human occupation and activity occur at more than 2 dozen locations in the eastern United States. Archaeologists generally assume that Native Americans inhabited these sites no more than 3,500 years ago.

A new investigation indicates that an oval grouping of 11 mounds in northern Louisiana, known as Watson Brake, took shape around 5,400 years ago as a base camp for the spring and summer activities of hunter-gatherers. If this dating estimate holds up, it will undermine the influential theory that major construction projects and other aspects of complex culture arose only in farming societies that had strict power hierarchies and plenty of slave labor.

"Planned large-scale earthworks such as Watson Brake were previously considered to be beyond the leadership and organizational skills of seasonally mobile hunter-gatherers," says project director Joe W. Saunders of Northeast Louisiana University in Monroe. "We have a lot of work to do before we begin to understand the full extent of social organization at Watson Brake."

Some archaeologists familiar with the new research, which appears in the Sept. 19 Science, see it as evidence of sophisticated cultural practices in prehistoric North America. Others await further analyses before accepting such an early age for Watson Brake.

The Louisiana mound complex, first discovered more than 30 years ago, features piles of compacted soil ranging from about 3 feet to nearly 25 feet high. Until now, the earliest documented age for a set of earthworks stood at around 3,500 years for a Louisiana site called Poverty Point.

Saunders' group conducted excavations in each mound at Watson Brake and removed soil for closer study.

Radiocarbon dating of excavated charcoal bits indicates that construction of the mound began about 5,400 years ago and use of the site extended over the next 400 years.

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