What is uniformitarianism?
Uniformitarianism (or the uniformitarian principle) is a doctrine that states that current geologic processes and natural laws are sufficient to account for all geologic changes over time. This is exemplified in the saying, "the present is the key to the past." The concept was first formally introduced around 1788 by Scottish geologist James Hutton (1726-1797). Later, in 1830, British geologist Charles Lyell (1779- 1875) originated the term "uniformitarianism" to describe this doctrine.
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