What two processes that helped James hutton to develop the idea of uniformitarianism?

James Hutton developed the idea of uniformitarianism through his observations of geological processes such as erosion and sedimentation. He recognized that the same natural laws and processes observed in the present, like volcanic activity and river formation, have operated in the past. This led him to propose that the Earth is shaped by continuous and gradual processes over immense time scales, contrasting with the then-dominant view of catastrophism.