The larger mound (15Be3) measured 131 feet in diameter and stood 20 feet tall. Before building the mound, the Adena people had erected a large (30-foot diameter) circular enclosure on the spot. The walls of this structure leaned outward slightly. There was no evidence that the walls had been bark-covered or that they had supported a roof. Rather, the enclosure probably functioned as some sort of screen that blocked ritual activities going on inside it from general view. Archaeologists found a large area of burned soil inside the enclosure, probably from a fire linked to the ritual activities.
While the circular enclosure was still in use, Adena people built a small earthen mound inside it, and buried the cremated remains of several individuals within it. Some time later, they covered both the circular enclosure and the mound with more soil.
In the years that followed, Adena groups who used the mound placed 52 log and bark-lined tombs within it, and it grew in size. Old and young adults, and males and females were represented in roughly equal numbers. Some tombs contained the remains of more than one individual, which suggests that mourners sometimes reused tombs. At least 100 individuals - 89 of which were interred in log and bark-lined tombs - eventually were buried in the mound.
During the mound's final period of use, Adena groups buried their dead in pits around it. Once the mound was no longer used as a cemetery, they capped it with a final layer of soil.
The smaller Robbins Mound (15Be14) was located about 100 feet south of the larger mound. It stood only about 2 feet high - historic plowing had reduced its height - and its diameter could not be determined. Unlike the larger Robbins Mound, 15Be14 held only one mortuary feature, probably a log-lined tomb containing from one to several individuals. The limited number of burials in this mound indicates that, in comparison to the larger mound, 15Be14 was used for a relatively short time.