Washed up on the beach.
Broken, weathered and exposed to the elements.
Isle of Wight last weekend, a perfect September day.
That’s a dinosaur (iguanodontid) footprint, left in mud in what was then a sub tropical swampy river delta around 140m years ago. It was in-filled with more sediment, which turned to rock, and as the sea eroded the layers under the cliffs this natural cast fell out.