The mood was giddy when scientists took the stage last week at the Denver Museum of Nature and Science to talk about what they're billing as an unprecedented fossil discovery.
Museum scientists working east of Colorado Springs have discovered plant and mammal fossils they say detail what happened in the million years after an asteroid hit Earth, wiping out dinosaurs and most other life forms.
Paleontologist Tyler Lyson made the key discovery when he found mammal fossils inside a type of rock called a concretion.
