When searching for the dinosaur fossils, paleontologists know that there is a particular layer within the Earth where the fossils disappear. That layer marked when an asteroid slammed into Earth 66 million years ago, inflicting dinosaurs go extinct and still wiping out more than 75% of the species. ( taxonomic classification)
After the mass extinction, including how quickly plant and animal life bounced back and what these creatures were outside of birds has remained murky.
That’s, till the Denver Museum of Nature & Science volunteer Sharon Milito picked up an egg-shaped rock known as a concretion at Corral Bluffs in Colorado. The stone contained a mammal palate inside. She introduced the rock back to the museum, where paleontologist Tyler Lyson discovered it in a drawer. The fossil impressed Lyson. Instead of on the lookout for hints of bone, he wondered if he should look for concretions.
However, Lyson and fellow curator and paleobotanist Ian Miller had been disappointed by a visit to Corral Bluffs before, only discovering literal fossils. Scientists have previously explored the outcropping of rocks in the Denver Basin 100 years before and found nothing, Miller stated.
Along with Milito’s discovery of the concretion, Lyson’s colleagues in South Africa searched for concretions slightly than bone as well. Fusions occur when rock forms around an organic nucleus, which might be bone, Lyson stated.
In 2016, Lyson and Miller returned to the Corral Bluffs. They struck historic gold., Corral Bluffs is a flood plain where sediment built up for one million years, by preserving a time capsule of both the environment and the life that thrived there.