A study published in the journal Communications Earth & Environment reveals the existence of a 60-million-year cycle combining tectonics, biogeochemistry, and marine biodiversity. By ...

The Geologic Time Scale 2012, or GTS2012, is the latest understanding of Earth's history, and the means by which geoscientists around the world investigate the rock record.

Using a geological time scale state the time in millions of years ago, for Cambrian period. What do the terms era, period, system and series mean with respect to a geological time scale?

Geologists categorize time by looking at changes they see in the earth’s rock or sediment layers. Take the very dramatic example of the end of the Mesozoic era, when dinosaurs went extinct.

In the reference text "The Geologic Time Scale 2012", Crutzen and colleagues lay out three main options for the start of the Anthropocene.

For most of us, the Pyramids symbolize the distant past. After all, they're more than 4,500 years old. But for geologists and paleontologists, they might as well have been built yesterday. That's ...

But they happen slowly – in geologic time unseen, unperceived, and unfelt by humans. The peak of the last ice age was 20,000 years ago, long before human civilization existed.

Construction, fossil-fuel burning and farming have changed the Earth's surface in unmistakable ways, but defining a human-driven, Anthropocene era is tricky, scientists say.