How did James Hutton help establish the science of geology?

James Hutton helped establish geology as a modern science by introducing the principle of uniformitarianism. This theory posits that Earth’s geological features are shaped by natural processes—such as erosion, sedimentation, and volcanism—that have operated with general uniformity over vast periods of geologic time.1

Hutton’s work, most notably his 1795 book Theory of the Earth, challenged the prevailing 18th-century belief that the Earth was only about 6,000 years old. He argued that the planet’s history was cyclical and inconceivably long, driven by internal heat and pressure rather than biblical events.1

While his original writing was often considered difficult to follow, his friend John Playfair published Illustrations of the Huttonian Theory of the Earth in 1802. This clear, precise condensation was instrumental in gaining scientific acceptance for Hutton’s ideas, effectively establishing the cornerstone upon which the science of geology is built.12