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erin-burnett » erin-burnett » Ma 1ère rubrique » Dinosaurs diversifié au fil du temps, pas soudainement (2)

Dinosaurs diversifié au fil du temps, pas soudainement (2)

Ils concluent que la grande folie de l'évolution des dinosaures a eu lieu à la fin du Trias, quelque 225 millions à 200 millions d'années. Il était environ 15-40 millions d'années après la première apparition des dinosaures.

Une seconde, mais les plus petits, la diversification s'est produite dans le centre du Jurassique, quelque 170 à 160 millions d'années.

À ce moment-là, toutes les principales lignées de dinosaures qui ont été hoofing autour de la Terre du Crétacé révolution a été créé.

« Notre nouvelle preuve confirme que le [Crétacé Terre Révolution] a été un élément clé dans la naissance de la moderne écosystèmes, mais que les dinosaures ne sont pas une partie de celui-ci », leur dit-papier.

"Exemple de biais" - de l'existence de nombreux fossiles de cette époque - pourrait être à blâmer pour la déformation de l'image, il le laisse entendre.

Un chef de file dans la théorie de la fin des dinosaures est un grand astéroïde ou une comète buter dans l'actuelle péninsule du Yucatan au Mexique, déclenchant firestorms et des nuages de poussière qui a occulté le dimanche, causant le changement climatique qui a ravagé la végétation.

Les plus petites créatures, conduit par les mammifères, qui ont été en mesure de s'adapter au nouveau climat et la nourriture disponible, hérité de la planète.
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