The stones were likely heated in a fire and quickly doused in cold water, cracking before being placed along the serpentine earthen mound. The result: a curving paved structure possibly used in a ritual by Britain's Bronze Age inhabitants.
The archaeologist who announced the discovery of the 65-yard-long "Rotherwas Ribbon" in western England said so-called "burnt stones" that cover the 4,000-year-old mound could shed more light on early civilization.
Mounds of burnt stones litter northern Europe and some experts believe they were once used in cooking. But their presence on the snakelike mound also suggests the stones were used in rituals, Herefordshire County archaeologist Keith Ray said Wednesday.
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