Scientists Discover New Evidence of the Asteroid That Killed Off the Dinosaurs – The Wall Street Journal, The Wall Street Journal

Drilling into the seafloor off Mexico, scientists have extracted a unique geologic record of the single worst day in the history of life, when a city-sized asteroid smashed into Earth 65 million years ago, wiping out the dinosaurs and three-quarters of all other life on the planet.

Their analysis of these new rock samples from the Chicxulub …