Lyel's theory that geological processes occurred over time led Darwin to formulate what concepts?

Lyell introduced Darwin to the concept that populations of organisms undergo long-term changes rather than the instantaneous mutations that other biologists had hypothesized.

According to the dominant biological theory put forth by Jean-Baptiste Lamarck, an organism acquires traits during its lifetime and then passes those traits on to its progeny. For example, if I were to work out a lot and gain a lot of muscle before becoming a parent, my progeny would naturally be naturally muscular.

Darwin began to question this theory in light of Lyell's theories, which inspired him to take a different approach. This led him to propose that natural selection operates over many generations at the population level rather than on the level of individual organisms.

Source: My reading on Darwin is extensive.

Darwin formulated the concept of uniformitarianism from Lyell's theory, which proposes that geological processes occur gradually over long periods of time. This concept influenced Darwin's ideas about gradual change and adaptation in species, contributing to the development of his theory of evolution by natural selection.