Watson Brake is the oldest known earthwork mound complex in North America, built by Middle Archaic hunter-gatherers in present-day Louisiana circa 3500 BCE.
Abandoned by its Middle Archaic builders around 2800 BCE, after a construction span of roughly 3500–2800 BCE; the site was not reoccupied and no direct successor polity is identified.
Standard comprehensive survey of North American prehistory; covers Middle Archaic mound cultures including the Louisiana context.
Scholarly reference covering Archaic-period cultures of North America in depth.