Meteor Crater, also known as Barringer Crater, in Winslow, Arizona, measures nearly a mile wide and 570 feet in depth. There are more than 160 known meteorite craters on the surface of Earth. PHOTOGRAPH REPRODUCED BY PERMISSION OF PHOTO RESEARCHERS, INC.
A timeline of the earth's history indicating when the Vredefort crater was formed in relation to some of the other important South African geological events. W indicates when the Witwatersrand Supergroup was laid down, C the Cape Supergroup, and K the Karoo Supergroup. The graph also indicates the period during which banded ironstone formations were formed on earth, indicative of an oxygen-free atmosphere. -- Vredefort crater - Wikipedia
Vredefort Dome, approximately 120 km south-west of Johannesburg, is a representative part of a larger meteorite impact structure, or astrobleme. Dating back 2,023 million years, it is the oldest astrobleme yet found on Earth. With a radius of 190 km, it is also the largest and the most deeply eroded. Vredefort Dome bears witness to the world’s greatest known single energy release event, which had devastating global effects including, according to some scientists, major evolutionary changes.