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Fossil pinpoint the day of the asteroid hit the earth, causing the mass extinction



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A new study released Friday captures fossilized snapshot of the day about 66 million years ago when an asteroid hit the earth, the fire was rain from the sky and the earth shook worse than any modern earthquake.

It was a day that almost all life on Earth became extinct, including the dinosaurs.

Researchers say they have found proof in North Dakota asteroid that hit Mexico, including fish from the hot glass in the gills with fiery debris that rained down on the planet. They also reported the discovery of charred trees, indicating that an inland tsunami and melted amber.

Hell Creek, Montana covering as Dakota and Wyoming to the & # 39 is a fossil treasure, which includes many species of dinosaurs, mammals, reptiles and fish, captured in clay and stone from 65 to 70 million years ago.

Separately, the University of Amsterdam Ian Smith said that he and his colleagues even found a dinosaur steps from shortly before their death.

Mr. Smith said the print of one of the plant-eating hadrosaur, and others with a meat eater, maybe a little Tyrannosaurus Rex "credible evidence that dinosaurs were alive and well at the moment of impact … They are running around, chasing each other" when they They were inundated.

discovery of the century

"This is a fatal blow remains at one particular place. It's just exciting, "said Purdue University geophysicist and influence expert Jay Melosh, who was not part of the study, but the edited document released Friday in the journal Proceedings of the National Academy of Sciences.

Mr. Melosh called this field "discovery of the century." But other experts say that while some of the work is interesting, they have some problems.

Kirk Johnson, director of the Smithsonian National Museum of Natural History, who also studied Hell Creek area for 38 years, said that the work on fish, glass and wood "show some details of what happened that day. This is all very interesting and very real material. "But Mr Johnson said that since there is limited access to the site, other scientists could not confirm the study. Mr. Smith said that the restrictions were to protect the site from poachers.

For decades, a massive asteroid crash that caused the Chicxulub crater in the Yucatan peninsula in Mexico was considered the probable cause of a mass extinction is often called «KT boundary" to separate between two geologic time periods. But some scholars insisted that the massive volcanic activity played a role.

Mr. Johnson and Mr. Melosh said that it helps to show the asteroid crash case.

There were only a few dinosaur fossils since then, but the steps & # 39 are the most compelling, said Mr. Smith.

According to the researchers, the tsunami in the internal points to powerful earthquake generated by an asteroid crash somewhere in between of 10 and 11.

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