Biggs site
The Biggs Site, also known as the Portsmouth Earthworks Group D, is an Adena culture archaeological site located near South [Shore, Kentucky|South Shore] in Greenup [County, Kentucky]. Biggs was originally a concentric Causewayed [ring ditch|circular embankment and ditch] surrounding a central conical burial mound with a causeway crossing the ring and ditch. It was part of a larger complex, the Portsmouth Earthworks, located across the Ohio River and now mostly obliterated by agriculture and the developing city of Portsmouth, Ohio.