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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.
Researchers report that the Cretaceous Chicxulub asteroid impact that resulted in the extinction of non-avian dinosaurs 66 million years ago, also rapidly acidified the oceans producing ecological collapse and long-lasting effects on the climate, and was a key reason for end-Cretaceous mass extinction.
The Cretaceous–Paleogene (K–Pg) extinction event, [a] also known as the K–T extinction, [b] was the mass extinction of three-quarters of the plant and animal species on Earth [2][3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.
1 wrz 2022 · The impact ejected magma, debris and vapors into the atmosphere, ignited wildfires and sent towering tsunamis across the globe. A period of intense cold and darkness followed an initial heatwave, as aerosols and particulates blocked out the sun. Sulfates from the atmosphere acidified the oceans.
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.
End of the Cretaceous (66 million years ago): Extinction of many species in both marine and terrestrial habitats including pterosaurs, mosasaurs and other marine reptiles, many insects, and all non-Avian dinosaurs. The scientific consensus is that this mass extinction was caused by environmental consequences from the impact of a large asteroid ...
