20 - 190 Million Year Old Footprint
190 million years ago (give or take an hour or so) a dinosaur crossed a mudflat and left its mark in a series of footprints. The prints dried in the sun, filled with sand and were covered in other layers. Over the millenia the forces of nature turned the mudflat into rock. Other forces tilted that rock and erosion once again exposed the footprints. Amazing.