From ecosystem change and soil quality to hydrology and natural hazards, Earth studies have never been so important. But in a crowded field of concerns, how can researchers prioritise the most ...

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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 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 ...

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.

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 ...

NH copy Purchased from the Cullman Endowment. Contents Volcanic tuff : Vulcan's wrath : the eruption of Vesuvius -- Native copper : the iceman and the island of copper -- Cassiterite : the "isles of ...

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