Feature 80 is a large, rectangular basin located at the northern edge of the Miami Circle. The walls are nearly vertical and have vertical cut marks. Four smaller holes are cut into the bottom of the basin, forming a line along the southern wall of the feature. Limestone cobbles were found packed into the bottom of the basin and surrounding some of the smaller cut holes. Midden material excavated from the feature contained animal bone, some marine shell, and a few pottery sherds.