The Cretaceous-Tertiary impact event was first discovered through the chemistry of sediments.

Question

Quizplus · Accepted Answer

The Cretaceous-Tertiary impact event, also known as the K-T event, was first discovered through the presence of a thin layer of iridium-rich sediment in rock formations around the world. This sediment is believed to have been deposited as a result of a large asteroid impact around 66 million years ago, which caused the extinction of the dinosaurs and many other species.

The Cretaceous-Tertiary Impact Event Was First Discovered Through the Chemistry