This is Adena, in the Central Scioto
The excavations of the Adena Mound directed by William Mills in 1901 illustrate field techniques that became a model for later Ohio Historical Society mound explorations. (Mills 1901-02). Excavations were done by slip scrappers and teams combined with hand work. The 26 foot high mound was divided into five vertical segments beginning at the top. The first four were each excavated as one unit.