As a period of geologic time, the boundaries of the Triassic are defined on the basis of rocks and the fossil record. It was the German geologist Friedrich August von Alberti who first marked the ...

The Cretaceous is a geological period that began 145 million years ago and ended 66 million years ago. It is the last period in the Mesozoic Era. It comes after the Jurassic Period and before the ...

According to this view, a once-tumultuous period of change had slowed to ... aspects of the forces Lyell believed had operated over geological time to produce the world we see now.

And this might have changed Earth’s climate and geological history forever. Around 466 million years ago, during a period ...

Work is under way at the International Union of Geological Sciences (IUGS) to define the Anthropocene, the period from 1950 that is marked by the human impact on the Earth’s environment ...