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 it represents will be told in a new documentary series from the BBC narrated by Sir David Attenborough. From the BBC News:
Very few dinosaur remains have been found in the rocks that record even the final few thousand years before the impact. To have a specimen from the cataclysm itself would be extraordinary[..]
Along with that leg, there are fish that breathed in impact debris as it rained down from the sky.
We see a fossil turtle that was skewered by a wooden stake; the remains of small mammals and the burrows they made; skin from a horned triceratops; the embryo of a flying pterosaur inside its egg; and what appears to be a fragment from the asteroid impactor itself.
"We've got so many details with this site that tell us what happened moment by moment, it's almost like watching it play out in the movies. You look at the rock column, you look at the fossils there, and it brings you back to that day," says Robert DePalma, the University of Manchester, UK, graduate student who leads the Tanis dig.