Charles Lyell published his "Principles of Geology" (1 jan 1830 ano – 1 jan 1833 ano)

Descrição:

- Lyell used the theory of Uniformitarianism to describe how the Earth's surface was changing over time
- this theory was in direct contrast to the geological theory of Catastrophism
- Lyell used geological proof to determine that the Earth was older than 6,000 years, as had been previously contested

- read by Tennyson in 1836 and 1837

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