Charles Lyell

Charles Lyell (1797–1875) was a Scottish geologist whose writings argued that observable geological processes, acting over immense spans of time, explain Earth’s features.

Uniformitarianism: The principle that geological processes observable today can explain features formed in the past. Lyell made this principle central to geology, while allowing that process rates and intensities could vary.
Principles of Geology: Charles Lyell’s influential multivolume work, published from 1830 to 1833, explaining geological change through observable processes. This book established Lyell’s case for interpreting the past through processes seen in the present.
Charles Darwin: An English naturalist who developed the theory of evolution by natural selection. Darwin credited Lyell’s geology with shaping his thinking about gradual change and the age of Earth.
History of geology: The development of ideas, methods, and institutions used to study Earth’s structure and history. Lyell helped move geology toward explanations grounded in present processes and extended time.
Deep time: The immense duration of geological history, far exceeding recorded human history. Lyell’s gradual explanations required vast spans for small changes to reshape Earth.
James Hutton: A Scottish geologist whose theory of Earth emphasized ongoing processes and immense geological time. Hutton supplied an earlier framework that Lyell systematized and popularized.
Mary Horner Lyell: A British geologist and scientific illustrator who collaborated with Charles Lyell and contributed to his fieldwork and publications. Her geological expertise and editorial work supported research often published under her husband’s name.
Evolution: The change in heritable characteristics of populations across generations. Lyell’s geological reasoning about gradual change influenced debates over biological evolution.
Stratigraphy: The study of rock layers and their relationships, used to reconstruct geological history. Rock sequences supplied evidence for the long history Lyell sought to explain.
John Playfair: A Scottish mathematician and geologist who clarified and promoted James Hutton’s geological ideas. Playfair’s exposition helped transmit Hutton’s work to the generation that included Lyell.

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