It was formed by the impact of an asteroid or comet approximately 142.5 0.8 million years ago, in the earliest Cretaceous Period, very close to the Jurassic - Cretaceous boundary..
Description: It was formed by the impact of an asteroid or comet approximately 142.5 0.8 million years ago, in the earliest Cretaceous Period, very close to the Jurassic - Cretaceo... view allDescription: It was formed by the impact of an asteroid or comet approximately 142.5 0.8 million years ago, in the earliest Cretaceous Period, very close to the Jurassic - Cretaceous boundary.. view less