DECRYPTION – European researchers came to this conclusion by studying… sturgeon fossils.
About 66 million years ago, an asteroid tens of kilometers in diameter fell on the Yucatan Peninsula in present-day Mexico, forming the huge crater of Chixculub – almost 200 kilometers in diameter. This cataclysmic event would have caused a rain of fire, a planetary tsunami and durably darkened the atmosphere (which would probably occur in the event of a world atomic conflict and which is then called, in this context, a “nuclear winter”). More than three quarters of the species did not survive there, and in particular the non-avian dinosaurs, the pterosaurs (flying reptiles) and most of the marine reptiles which reigned supreme on the planet until then. The disaster marks the end of the Cretaceous, the last period of the Mesozoic era.
If the debate continues to know when this event would have occurred exactly – within a few hundred thousand years -, scientists now think they can affirm that the fall would have been…