Where I come from there used to be coal mining and coal developped under pressure from prehistoric forests. So there were plenty of slag hills and there you could find wonderful fossils. I still have a big petrified mushroom ( the type that grows on the side of a tree) and some horsetails on my balcony. I think it is very exciting to find things like that
Unfortunately in our slag hills animals would be extremely rare and there were no dinosaurs at all