Two of Earth’s five confirmed mass extinction events could have been caused by nearby supernova explosions stripping the ...

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 ...

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 ...

But first there was a period of biological regrouping following the disastrous climax to the Ordovician ... The Silurian drew to a close with a series of extinction events linked to climate ...

These first steps toward life on land were cut short by the freezing conditions that gripped the planet toward the end of the Ordovician. This resulted in the second largest mass extinction of all ...

They believe a supernova explosion close to Earth could be to blame for both the late Devonian and Ordovician extinction events, which occurred 372 and 445 million years ago respectively.

They believe a supernova explosion close to Earth could be to blame for both the late Devonian and Ordovician extinction events, which occurred 372 and 445 million years ago respectively.

We study trilobites from four periods of the Palaeozoic: the Cambrian, Ordovician, Silurian and Devonian. Our research covers trilobite taxonomy, phylogeny, functional morphology, biogeography, and ...