Several mounds stand at Seminole Rest, including Snyder’s Mound, the largest, which is made not of a single mass of shells but in some areas of seventeen different layers deposited over time. Archeologists study these layers for clues to the Timucuans. Clamshells make up most of the mound layers, although oyster, conch, and welk shells and the remains of sea trout, shark, and bass were also found, indicating the site was mostly used for harvesting clams. Some layers suggest periods when the mound was not used and became overgrown with vegetation. Remains of poke berry, palm berry, hackberry, and skullcap show that vegetation has changed very little over the centuries, and many of these plants may have been used by the Timucuans for food, fuel, or medicine. A small mound adjacent to Snyder’s Mound dates from A.D. 500 to 900 and was deliberately constructed, possibly as a house mound.