High Quality Content by WIKIPEDIA articles! The Wolf Plains Group is a Late Adena culture group of 30 earthworks including 22 conical mounds and nine circular enclosures.The Plains, originally known as Wolf`s Plains, located a few miles to the northwest of Athens, is a relatively flat terrace in an area of hilly terrain in southeastern Ohio’s Hocking River valley. The terrace was formed by glacial outwash coming down the Hocking River, which became dammed at The Plains and found a new outlet to the northeast, leaving the terrace in place.