The famous geological statement, "The present is the key to the past," explains the core idea of uniformitarianism.
This principle means that the same natural laws and geological processes operating today have also operated in the past, enabling us to interpret Earth's history by studying the present.
This statement is most famously associated with:
James Hutton, a Scottish geologist, is credited with establishing this principle. His work laid the foundation for modern geology by emphasizing gradualism and the vast age of the Earth. He reasoned that observing current geological processes could unlock the secrets of Earth's ancient history.