Acrocanthosaurus footprint preserved in ancient rock with murky water filling.
Overhead view of a trace fossil with an Acrocanthosaurus footprint, embedded in rock, with some water filling in. The footprint shows three, oblong-shaped toes from the dinosaur, with a concave interior, that is filled with gray, murky water halfway. The rock it's inside is a rough, gray stone with some black leaves scattered around the footprint. To the right edge of the frame, the rock ends, with some murky water in partial view.