This is a point known to geology as the KT boundary1 and it marks the time, 65 million years ago, when the dinosaurs and roughly half the world’s other species of animals abruptly vanish from the fossil record.
Bill Bryson
This is a point known to geology as the KT boundary1 and it marks the time, 65 million years ago, when the dinosaurs and roughly half the world’s other species of animals abruptly vanish from the fossil record.