A few hours hike from where I was born is one of those special places on this planet. About 40 years ago I returned to this place and took some photos. Here is one:
About 115 million years ago dinosaurs walked through this region and left footprints in soft mud. These tracks were subsequently covered by a different material, and whole business eventually became over layered by limestone and other formations. Since then the Paluxy river has eroded the overlay and exposed many footprints in the limestone riverbed.
You can see existing footprints in Dinosaur Valley State Park, and you can also see prints in the riverbed upstream from the park. This photo was taken where the road from Tolar (where i was born) used to ford the shallow river. There’s a bridge now, so you would have to park and take a short hike along the river to find any prints.
The prints are not permanent. The same action that exposed the prints will eventually destroy them. For your enlightenment take a short drive and visit some 115 million year old history.