Lewisville Prehistoric Site
Lewisville, TX
When the Lewisville Dam went up in 1950, workers turned up ancient artifacts, and archaeologists raced to excavate before the reservoir drowned the site. Their digs uncovered 21 hearths along with animal bone, plant remains, and lignite burned for fuel—material that radiocarbon dating placed at roughly 12,000 years old. The finds closely resembled those at the Clovis site in New Mexico, tying this Texas ground to some of the earliest known peoples of North America.