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Earth’s history

Left, a fossilized thecamoebian believed to have lived 720-635 mya. Right, a specimen from a group of modern amoebozoan testate amoebae

Earth’s Biodiversity Was More Complex 800 Million Years Ago Than Previously Thought

Artist's impression of the asteroid slamming into tropical, shallow seas of the sulfur-rich Yucatán Peninsula in what is today Southeast Mexico. The aftermath of the asteroid collision, which occurred approximately 66 million years ago, is believed to have caused the mass extinction of non-avian dinosaurs and many other species on Earth. The impact spewed hundreds of billions of tons of sulfur into the atmosphere, producing a worldwide blackout and freezing temperatures which persisted for at least a decade.

Asteroid That Killed the Dinosaurs: New Study Reveals Its Unlikely Origin

Impact craters and their broader structures can be visible in a geologic map, like a bullseye. But what geophysical traces remain at the structure’s outermost edges?

Earth’s most ancient impact craters are disappearing

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