The "Big Five" mass extinctions of the Phanerozoic Eon have long attracted significant attention from the geoscience ...

The "Big Five" mass extinctions of the Phanerozoic Eon have long attracted significant attention from the geoscience ...

Up to this study, scientists had accepted five mass extinctions on the record. The Ordovician-Silurian extinction was 440 million years ago; Devonian extinction was 365 million years ago ...

This era reflects The Ordovician-Silurian mass extinction that is among the “Big Five.” All the “Big Five” extinctions resulted from a combination of rapid climate change and significant ...

scientists have found little evidence that any of these occurred at the onset of the Ordovician-Silurian extinction. So the extremely high levels of toxic metals, the authors concluded ...

World Reef Awareness Day 2025 highlights the coral reef crisis and the urgent need for global conservation action.

although it’s unclear if whether that amounts to a sixth mass extinction. The Ordovician-Silurian mass extinction event may have wiped out some 85 percent of species, including many of the ...

Ordovician-Silurian Extinction (about 443 million years ago): Around 85% of species went extinct, likely due to a combination of a drop in sea levels and glaciation, followed by rising sea levels ...

There are five known mass extinctions that stand out in the history of animals, the "Big Five," according to Xiao, including the Ordovician-Silurian Extinction (440 million years ago), the late ...