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30 maj 2018 · Micro- and nannofossil, trace fossil and geochemical evidence from the Chicxulub impact crater demonstrates that proximity to the asteroid impact site did not determine rates of recovery of...
1 wrz 2022 · Mammals, a relatively unremarkable group of small nocturnal organisms during the Cretaceous, proliferated during the Paleogene. The absence of dinosaurs allowed them to expand into new, diverse ecological roles. Big, leafy angiosperms, previously outnumbered by gymnosperms, gave birth to modern rainforests.
11 maj 2016 · The end-Cretaceous mass extinction ranks among the most severe extinctions of all time; however, patterns of extinction and recovery remain incompletely understood. In particular, it is unclear how severe the extinction was, how rapid the recovery was and how sampling biases might affect our understanding of these processes.
The extinction occurred at the end of the Cretaceous Period, about 65.5 million years ago. Who became extinct? In addition to the non-avian dinosaurs, vertebrates that were lost at the end of the Cretaceous include the flying pterosaurs, and the mosasaurs, plesiosaurs and ichthyosaurs of the oceans.
2 dni temu · This event is possibly best known for wiping out the dinosaurs, and is one of the most well-studied mass extinctions in Earth’s history. Geological evidence shows two possible contributors to the extinction. First, the Earth was struck by an object from space, resulting in a massive impact event.
8 gru 2021 · The end-Cretaceous Chicxulub impact triggered Earth’s last mass-extinction, extinguishing ~ 75% of species diversity and facilitating a global ecological shift to mammal-dominated biomes.
The researchers say it is the first direct evidence that the Cretaceous-Paleogene extinction event 66 million years ago coincided with a sharp drop in the pH levels of the oceans — which indicates a rise in ocean acidity.
