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Since the Cambrian Explosion, ecosystems have suffered repeated mass extinctions, 5 of which wiped out half of all species: The Cretaceous–Paleogene extinction, the Triassic–Jurassic extinction, the Permian–Triassic extinction, the Late Devonian extinction and the Ordovician–Silurian extinction.20 years ago, a sixth major extinction was put forth i
Permian Period, in geologic time, the last period of the Paleozoic Era, lasting from 298.9 million to 252.2 million years ago. The climate was warming throughout Permian times, and, by the end of the period, hot and dry conditions were so extensive that they caused a crisis in Permian marine and terrestrial life.
Before it was vast ponderosa pine forest, northern Arizona was covered by a warm, shallow sea. Marine organisms resembling ancient clams, nautiluses, and corals thrived in its waters…and so did several dozen different kinds of sharks.
The map was built using research from Northern Arizona University and reveals that humans are 'just a blip in history', according to Ian Webster, the former Google engineer behind it.
Authors say extinction events making up 'Great Dying' happened 3 million years apart and originated in volcanic eruptions in South China Sea whose effects could correlate with those of global warming