These familiar marine arthropods first arose about 545 million years ago in the early Cambrian and thrived throughout the world's oceans until they were wiped out in the Permian extinctions about ...

Others propose that an extinction of life just before the Cambrian opened up ecological roles, or "adaptive space," that the new forms exploited. External, ecological factors like these were ...

Twenty million years after the Cambrian explosion ... of sulfidic waterbodies in the global ocean at the major mass extinction levels,” wrote the study’s authors. High concentrations of ...

But we haven't found any such simple solution to the Permo-Triassic mass extinction, at least not yet. Q: I heard that accelerated continental drift occurred in the Cambrian and Permian Periods.

which navigated through multiple cycles of flourishing and extinction, culminating in the emergence of a complex ecosystem characterized by the iconic Cambrian explosion when a wide variety of ...

The archaic sponge reef-dwellers of the Cambrian gave way to bryozoans ... This resulted in the second largest mass extinction of all time, wiping out at least half of all marine animal species ...