A

David

Darling

astrobleme

Sudbury Crater, Ontario

Manicougan Crater, Quebec, Canada.


An astrobleme is an eroded impact crater on Earth of which about 150 are known. Among the largest are the 200-kilometer-wide Sudbury Crater in Ontario, Canada, and the 180-kilometer-wide Chicxulub Crater which extends into the Gulf of Mexico. While some astroblemes are almost 2 billion years old, about 60% were formed within the past 200 million years.