Stone Age Footwork: Ancient human prints turn up down under Bruce Bower Researchers working near the shore of a dried-up lake basin in southeastern Australia have taken a giant leap backward in time. They've uncovered the largest known collection of Stone Age human footprints. SOLE SURVIVAL. Footprints attributed to a Stone Age person disappear under an Australian dune (top). In an impression of an adult's right foot (inset), the toes stand out. Cupper The 124-or-more human-foot impressions, as well as a few prints left by kangaroos and other animals, originated between 23,000 and 19,000 years ago in a then-muddy layer...