(For North American readers, the chemist is the pharmacist ... atmosphere and biosphere. Many of the slices of the Geologic Time Scale are divided by when big events cause big changes and there are a ...

The Geologic Time Scale 2012, or GTS2012 ... and are a source rock for shale gas throughout North America. His work has been funded through the National Science Foundation as well as industry ...

We will provide a list of web sites with relevant information. The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ...

The horseshoe-shaped Midcontinent Rift is a 2,000-kilometer scar that is also called North America's 'broken heart' by enthusiasts.

Cratons are the most ancient, stable pieces of tectonic plates, but even these geological formations can change over time. A new study details how the North American plate is “dripping” into ...

For something that is supposed to keep track of 4 billion years of history, the geologic time scale is quite a fuzzy and slippery ... The newly marked Turonian GSSP is in a railroad cut north of ...

PepsiCo disclosed mixed fourth-quarter earnings Tuesday amid ongoing challenges in North American markets ... to Trump Dallas Cowboys Legends: 25 All-Time Greatest Players in Franchise History ...

The geological time scale helps us grapple with the vast swaths of time that life has existed on Earth, dividing it into eras, periods, and epochs. With our illustrated version, explore 4.5 ...

The geologic time scale provides the official framework for our understanding of Earth’s 4.5 billion-year history. Geologists break down our planet’s history into eons, eras, periods ...

reflected a period of drought that led to the collapse of civilisations in north Africa, the Middle East and Asia. “...The beginning of this youngest time interval of the Geologic Time Scale ...

It's called the Meghalayan, and it was officially added this week to the International Geologic Time Scale. The scale divides ... ice sheets into the North Atlantic. Martin Head, a geologist ...