There's a billion-year gap in Earth's geological history. A new study seeks to explain the mystery.

In 1869, John Wesley Powell was studying layers of rock in the Grand Canyon when he noticed an unconformity in the layers. Around a billion years were missing, and the problem turned out to be global.

Here’s what you’ll learn when you read this story: Usually, geologic layers build on one another, with younger rocks piling on top of older ones. A new study, however, shows that this process is ...

Geology in our middle Colorado River watershed isn’t a simple affair, but it’s not remarkably complicated or incredibly obscure, either. It follows the general principles of geology, with young layers ...

The devastation from the earthquakes in Haiti and Chile is a reminder of ever-present, powerful geologic forces. Aspen is a long way from the present day’s colliding plates of converging continents, ...

I love the Grand Canyon, both personally (because of all the good memories I have of my adventures there), and as a scientist. I first saw it in the early summer of 1981 when I went on a six-week-long ...