Thursday, May 31, 2018

Life made a quick comeback after asteroid that killed the dinosaurs

He co-authored a study, published in the scientific journal Nature, on what happened at the impact zone in the first 200,000 years after the so-called K-Pg mass extinction event.

“We found the oldest fossils within a layer of the core that we know was deposited by settling from turbid waters,” explained Lowery.

These waters were full of sediment, churned up by landslides and tsunamis after the impact, which settled over the course of a few years.

“We can calculate the amount of time this took using an equation called Stokes’ Law because we know the size of the sediments, their density, and the depth of the water,” Lowery said.

“Thus, we can say with confidence that this layer was deposited within a few years. Because we find the first fossils of post-impact organisms within this layer, we know that they lived and died in the crater within years of the impact.”

Previous studies had noted slow recovery around the crater, with sites in the North Atlantic and the Gulf of Mexico taking longer to return to pre-extinction levels — up to 300,000 years — than regions further away.

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Baca Di sini Bro https://www.timeslive.co.za/news/sci-tech/2018-05-31-life-made-a-quick-comeback-after-asteroid-that-killed-the-dinosaurs/

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