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.

Venus is often called Earth’s twin, but the two planets evolved into dramatically different worlds. Scientists believe the explanation may lie in the planet’s geology and the absence of key geographic ...

A layer of rock just 520 million years old sat directly on top of ancient rock dating back 1.4 to 1.8 billion years.

A thin slice of the ancient rocks collected from Gakkel Ridge near the North Pole, photographed under a microscope and seen under cross-polarized light. Field width ~ 14mm. Credit: E. Cottrell, ...

The Department of Geology is about much more than rocks and minerals. Its faculty and students perform cutting-edge research on everything from how glaciers react to climate change to how molten lava ...