How the geologist Charles Lyell influenced Darwin's ideas about how evolution works?

Charles Lyell's principle of uniformitarianism, which proposed that geological processes occur gradually over long periods of time, influenced Darwin's thinking by suggesting that biological changes could also happen gradually through natural selection. Darwin saw parallels between gradual geological changes and gradual evolution of species, leading him to develop his theory of evolution by natural selection. Lyell's emphasis on the importance of evidence and observation also encouraged Darwin to gather more data to support his theory.