Poverty Point, Louisiana
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Poverty Point mounds are a rare remnant of an advanced culture that thrived here from 1650 to 700BC. Estimates are that it took about five million man hours to build the sites visible earthworks. Dirt was carried to the site in baskets with about 50-pounds of capacity. The organization and engineering knowledge of this community was advanced. The visible mound complex covers about 400 acres. This is a significant accomplishment for a pre-agricultural society. The most interesting mound system consists of six rows of concentric low ridges. These ridges may have been 5 feet high based on estimates from observing the least eroded ridge remnants located in the wooded portions of the site. The distance from the inner to outer ridge is about 3500 feet.