A team of US researchers has discovered an exceptionally well-preserved fossil fish that died 66 million years ago, when he crashed into an asteroid that sealed the fate of the dinosaurs.
These fossils of fish and other hereditary animals They were found at the site in North Dakota, 3000 kilometers from the crater Chicxulub, in the Caribbean, which has been hitting the asteroid.
The study, to be published Monday in the journal Proceedings National Academy of Sciences (PNAS)Showing how the episode had a devastating and rapid impact on large areas, says lead author Robert DePalma, quoting a specialized website EurekAlert.
"It's like a museum at the end of the Cretaceous layer in the meter and a half thick," said Mark Richards, another author and professor emeritus of the University of California at Berkeley, in a statement of the Institute.
The turmoil caused by an asteroid giant waves generated in an inland sea that existed in what is now North Dakota, arriving in the adjacent river, where several fish live, the reverse current, the statement said.
Streams of stones and debris fell on the fish, which were buried in another wave, and froze for a long time.
"The interweaving of freshwater fish, terrestrial vertebrates, the trees (…) and other sea creatures have been packed into this layer," said Robert DePalma.
According to investigators, inhaled fragments promoted under the influence of the asteroid were found in the gills of the fish to death. Some of the fish were killed simply because of the ingestion of these materials.
Biodiversity disclosed on the site is typical. "At least some samples of new species and the other the best examples of a kind of" welcome DePalma.
"We are faced with an instant recording of one of the most important events in Earth's history. There is no other place which has tracks like these. "
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