A river flowed a hundred yards away and sunlight seeped through the dense stand of trees, perhaps giving a glimpse of what life was like for Native Americans living in the area more than four centuries ago. “I could live here,” said one of the workers at the dig, pausing to breathe in the North Georgia mountain air. People are believed to have lived and toiled in the remote but tranquil valley in the heart of the Chattahoochee-Oconee National Forests, where a group of volunteers and Forest Service workers dug into the cool, soft earth.