How did James Hutton explain Earth’s long geologic history?

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Faux amphibolite — geology A rock formation called “faux amphibolite,” from the Nuvvuagittuq greenstone belt in northern Quebec, dated to 4.28 billion years ago.

James Hutton, often called the father of modern geology, challenged the 18th-century belief that Earth was only 6,000 years old by proposing the principle of uniformitarianism.1

Rather than relying on biblical narratives, Hutton argued that Earth’s features are the result of natural processes—such as erosion, deposition, and volcanic activity—that have operated with general consistency over immense geologic time. He posited that these processes are cyclical: land is worn down by erosion, deposited as sediment in the ocean, and subsequently solidified into rock through heat and pressure. This rock is then uplifted by subterranean forces to form new land, which eventually undergoes the same cycle again.1

Because these cycles require vast amounts of time to shape the planet's surface, Hutton concluded that the age of the Earth must be inconceivably great. His foundational work, Theory of the Earth, shifted geology toward a scientific discipline based on observable, ongoing natural phenomena.1