 Sears found muck with midden materials between the mounds and on the lower slopes of the mounds, but the bulk of the mounds were clean shell deposits, almost entirely made up of small oyster shells, which had been placed on submerged mud flats.Based on dating of potsherds found at the site, Sears concluded that the residents of the site had lived on the edge of the river, moving the village towards the water as the mounds built up behind them.All of the potsherds collected at the site were assigned to the Glades I and II periods, placing occupation of the site in the period from about 200 or 100 BCE to 800 or 900 CE.