This incredible dinosaur leg fossil was found at North Dakota's Tanis site. The creature—and others at the site—were likely killed by the impact of the 12 kilometer-wide Chicxulub asteroid that crashed into the Gulf of Mexico 66 million years ago and eradicated 80% of Earth's animals. The scientific story of the fossil's discovery and what … Continue reading Look at this astonishingly well-preserved leg of a dinosaur likely killed by an asteroid