James Hutton and Joseph Black, natural philosophers, talking together. James Hutton (June 3, 1726 - March 26, 1797) was a Scottish geologist, physician, chemical manufacturer, naturalist, and experimental agriculturalist. He originated the theory of uniformitarianism - a fundamental principle of geology - that explains the features of the Earth's crust by means of natural processes over geologic time.

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James Hutton and Joseph Black, 1787

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