The Great Serpent Mound is an enormous earthwork shaped like a snake eating an egg and located in Ohio. It's 1,348 feet long, and attributed to various peoples. Carbon dating of charcoal fragments previously placed the Serpent's beginnings around the year 1070, but new research apparently suggests that it might actually be 1,400 years older than this--new carbon dates place the mound's beginnings around 321 BCE. Researchers suggest the later date may represent a layer of repairs made after a thousand years of wear had taken their toll on the Serpent.
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