The Summerour Mound Site, (9FO16), is an archaeological site located in Forsyth County, Georgia, formerly on a floodplain of the Chattahoochee River in northern Georgia but it is now under the Buford Reservoir, also known as Lake Lanier. This mound site was excavated in 1951–54 by Joseph Caldwell. The platform mound at the site was "considerably spread out in cultivation and ... now an oval, with a nearly level summit plateau about 225 feet (69 m) long, 150 feet (46 m) wide, and 9 feet (2.7 m) high." Caldwell found a temple or other public structure on the mound summit. It was rectangular, 18.5 feet (5.6 m) long by 16 feet (4.9 m) wide, the outer walls constructed of small posts set in wall trenches. The mounds chronology is in debate, with its original excavator placing it in the Early Mississippian Woodstock phase and later archaeologists arguing for an earlier Late Woodland period construction. Several styles of Native American pottery sherds were found at the site, including B-complex Swift Creek, Napier Complicated Stamped, and plain pottery.