Recent studies show that destroyed the lives of dinosaurs 65 million years ago caused by a beating at least two meteorites. Until now, scientists consider a single meteorite collision that destroyed them.
Previously, scientists have identified a large crater in the Gulf of Mexico as destructive events for the dinosaurs. Now the evidence has been found both in the Ukraine. This raises the possibility that Earth may have again bombarded by meteorites.
These new findings published in the journal Geology by Professor David Jolley of the University of Aberdeen.
When first proposed in 1980, the idea that meteorite impacts have killed the dinosaurs are still highly controversial. Then, the discovery of Chicxulub crater in the Gulf of Mexico, the United States, is considered a shot that justifies the theory.
The second discovery of the crater showed that the dinosaurs became extinct is driven by the collision of two times a meteorite, not a single attack.
Boltysh crater in the Ukraine were first reported in 2002. However, until now not clearly related to the time of the Chicxulub Crater.
In that study, scientists examined pollen and spores from plant fossils in layers of mud that fills the crater. They found, after the collision, the fern quickly meet the landscape.
Fern has a remarkable ability to bounce back after a disaster. Management layer of fern spores is considered a good indication of the impact of past events.
However, there was an unexpected discovery there. They found a second layer of ferns in one-meter layer above the first. It shows the impact of events before the collision.
Professor Simon Kelley of the Open University, another writer in the study, said, "We interpret this as the second layer after the Chicxulub impact crater."
This suggests that the Chicxulub Crater Boltysh and does not occur at the same time. They are separate layers for thousands of years seen from these two ferns. (* / BBC/OL-5)
Previously, scientists have identified a large crater in the Gulf of Mexico as destructive events for the dinosaurs. Now the evidence has been found both in the Ukraine. This raises the possibility that Earth may have again bombarded by meteorites.
These new findings published in the journal Geology by Professor David Jolley of the University of Aberdeen.
When first proposed in 1980, the idea that meteorite impacts have killed the dinosaurs are still highly controversial. Then, the discovery of Chicxulub crater in the Gulf of Mexico, the United States, is considered a shot that justifies the theory.
The second discovery of the crater showed that the dinosaurs became extinct is driven by the collision of two times a meteorite, not a single attack.
Boltysh crater in the Ukraine were first reported in 2002. However, until now not clearly related to the time of the Chicxulub Crater.
In that study, scientists examined pollen and spores from plant fossils in layers of mud that fills the crater. They found, after the collision, the fern quickly meet the landscape.
Fern has a remarkable ability to bounce back after a disaster. Management layer of fern spores is considered a good indication of the impact of past events.
However, there was an unexpected discovery there. They found a second layer of ferns in one-meter layer above the first. It shows the impact of events before the collision.
Professor Simon Kelley of the Open University, another writer in the study, said, "We interpret this as the second layer after the Chicxulub impact crater."
This suggests that the Chicxulub Crater Boltysh and does not occur at the same time. They are separate layers for thousands of years seen from these two ferns. (* / BBC/OL-5)
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