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.
Vredefort Crater - Asteroid impact date: Estimated 2 billion years ago. Location: Free State, South Africa. Also known as the Vredefort Dome, the Vredefort crater has an estimated radius of 118 miles (190 kilometers), making it the world's largest known impact structure.
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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.
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Vredefort dome - Free State Province - Stand inside a huge crater! Not only is it the oldest crater found so far on Earth, but it is nearly twice as big as the impact that killed the dinosaurs. Vredefort crater is about 300 km wide, and said to be the largest that has ever struck the earth. Estimated to be two billion years old, you’ll be blown away by the impact at this World Heritage Site.
Young earth v. old earth: If this had happened sometime within the last 6,000 years, I kind of think it would have been noticed. :) "The multiple-ringed Vredefort Crater - The asteroid that hit Vredefort is estimated to have been one of the largest ever to strike Earth (at least since the Hadean Eon some four billion years ago), thought to have been approximately 5–10 km (3.1–6.2 mi) in diameter. The bolide that created the Sudbury Basin could have been even larger."