These fossil beds reveal a collection of organisms found around a prehistoric lake during the Early Cretaceous, some 125 million years ago. These fossil beds belong to a very rare type of preservation called lagerstatten, which preserves the fine details of flesh, fur, and feathers. In 1996, this formation and region became a scientific goldmine when the fossils of a dinosaur, Sinosauropteryx prima, was discovered with feathers. More feathered dinosaurs and unique animal fauna has been uncovered. So far, very few large animals get preserved.