From Ohio History Central
The Pollock Works site is a Hopewell culture (100 BC - AD 500) ceremonial center located in Greene County. It consists of a series of earthen embankments ranging from three to ten feet in height that partially enclose a large, 120-acre, plateau located along Massie Creek.
Robert Riordan, an archaeologist with Wright State University, has directed many seasons of excavations at the Pollock Works revealing a complicated site history. The works appear to have been constructed in five major stages beginning as early as AD 50. One of these stages involved the erection of a large, timber stockade along the top of the earthen embankments. Later, the stockade was burned down and the charred remnants were buried. Apparently, this enclosure was used both for ceremony and as a defensive fortification at different times.
The Pollock Works are listed on the National Register of Historic Places. The site is preserved and maintained by the Greene County Park District at the Indian Mound Reserve. In addition to the Pollock Works, the Indian Mound Reserve also includes the Williamson Mound, a large conical burial mound likely built by the Adena culture.