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

Much of our understanding of Earth's past is derived from stratigraphic records exposed in rock outcrops or recovered from drilled cores. These records span immense time intervals, from thousands to ...

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.

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.

Mysterious parallel microtunnels discovered in rock defy geology and could be the work of unknown microscopic ancient life.

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A new analysis of rocks thought to be at least 2.5 billion years old helps clarify the chemical history of Earth's mantle -- the geologic layer beneath the planet's crust. The findings hone scientists ...

The pattern of geological boundaries may not be as unstable as people have thought, as these boundaries exist between geological wedges of time, like eons, periods, and epochs. Each of these wedges is ...

Introduction. The study of the earth / J.F. White -- The law of uniformity and geologic time. James Hutton / Karl von Zittel -- The uniformity of nature / Charles Coulston Gillispie -- Measuring ...

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, ...