5,400-Year-Old Mound Complex Found in Louisiana Predates Egyptian Pyramids
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Archaeologists have identified a 5,400-year-old monumental mound complex in Louisiana's Ouachita River valley. The Watson Brake site, built by hunter-gatherers around 3400 BC, predates the earliest Egyptian pyramids by nearly 2,000 years. The discovery reshapes understanding of ancient construction in North America.
Key Facts
- The Watson Brake complex consists of eleven mounds connected by ridges arranged in a circle.
- Radiocarbon dating shows construction began around 3400 BC and continued for approximately four centuries.
- The site is about 1,900 years older than other known mound complexes with earthen enclosures in North America, according to a 1997 study.
- The largest mound reached approximately 7.6 meters in height.
- Archaeologists estimate construction of the mounds and ridges required about 100,000 hours of labor.
Discovery and Excavation
Amateur archaeologist Reca Jones first noticed structured formations in the landscape in 1981. After clearing parts of the area, Jones found eleven mounds connected by ridges and arranged in a circle. Archaeologist Joe Saunders later studied the site while researching other ancient earthworks in Louisiana. The complex remained hidden for millennia beneath trees, roots, and swamp vegetation in the Ouachita River valley.
Construction and Builders
Builders intentionally compacted the soil beneath the mounds, which helped preserve the structures for thousands of years. The site layout shows careful organization, with builders aligning parts of the complex with the surrounding landscape before adding new mounds and connecting ridges. The builders belonged to the Evans culture, a Paleo-Indian population that relied on seasonal movement, hunting, fishing, and gathering rather than agriculture. The estimated 100,000 hours of labor indicate a high level of cooperation among the people who built the complex.
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5,400-Year-Old Mound Complex Found in Louisiana Predates Egyptian Pyramids
