Ly·ell (l   l), Sir Charles 1797-1875. British geologist whose Principles of Geology (1830-1833) opposed the catastrophic theory of geologic change. A leading proponent of uniformitarianism, he is considered one of the founders of modern geology. |
| Lyell, Mount A peak, 3,994 m (13,095 ft) high, of the Sierra Nevada in east-central California. |
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