This illustrated geologic timescale of Earth focuses on the landscapes, flora and fauna of the West, drilling into the region’s deep history.

Most of the time, the shape of Earth’s magnetic field is quite similar to that which would be produced by a bar magnet ...

The Verde Mining district grew to become one of the greatest copper producers in Arizona from 1883 until 1992. Two primary mines produced more than 99% of the district’s copper production: the United ...

We show how this "cosmic clock" uncovers the evolution of rivers, coasts and habitats.

However, direct field observation continues to show that not all architectural elements within the plateau fit comfortably within these established models. The Mortuary Temple of Khafre, located on ...

Jonathan Paul does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

This piece is part of a special project on deep time examining what the Western U.S. was like thousands, millions and even billions of years ago, and how that history is still visible and ...

What we know today as Sabino Canyon was the site of a whole lot of scrunching 25 million years ago. In a geologic nutshell: Two ancient types of rock - 1.4-billion-year-old Oracle granite and ...

In just a few decades, mobile phones have gone from a luxury reserved for the elite to an essential tool for billions of users. From the first in-car phones of the 1940s to the best smartphones of ...