Who was Charles Lyell what concept influenced Darwin?

Charles Lyell was a 19th-century geologist known for his work "Principles of Geology," which popularized the concept of uniformitarianism—the idea that the Earth's features were shaped by continuous and consistent geological processes over long periods. This concept influenced Charles Darwin by providing a framework for understanding how slow, gradual changes could lead to significant biological evolution over vast timescales. Lyell's emphasis on deep time helped Darwin appreciate the extended periods necessary for natural selection to effect substantial changes in species.