Ancient petroglyphs engraved on an exposed Sharon Sandstone outcrop at Leo are among Ohio's finest examples, carved by ancestors of American Indians and likely created by the Fort Ancient culture as much as 1,000 years ago. Although their meaning is uncertain, the symbols may tell a story important to the ancient people who once lived here, and the most iconic figure, a human head with deer antlers and bird's feet, may represent a shaman or supernatural being. The surrounding preserve also features a nature trail through a deep gorge and along the cliff tops, where the area's natural history includes Sharon Sandstone formed about 300 million years ago, older white quartz pebbles embedded in the rock, Eastern Hemlock growing in the cool ravine as an Ice Age remnant, and habitats that support rare plants, salamanders, wildflowers, and abundant seasonal birds.