The geologic time scale is divided into eons ... The end of the Paleozoic and beginning of the Mesozoic 251 million years ago marks the largest mass extinction in the history of the planet, which ...

Earth's 4.5 billion year geological history is full of death and rebirth, mass ... time. But the IUGS disagrees this constitutes enough global impact to be a formal unit of the Geologic Time Scale.

According to the International Union of Geological Sciences (IUGS), the professional organization in charge of defining Earth’s time scale ... kind has caused mass extinctions of plant and ...

Mayhem and destruction -- the geologic events that make Earth a deadly planet! We will explore the origin and evolution of Earth and life, extraterrestrial impacts, mass extinctions, earthquakes and ...