This intrusion and uplift and erosion is similar to the events recorded by other angular unconformities. Note my reasons for believing the granite to be older even without seeing direct evidence for weathering and erosion. DON'T assume the granite is older just because it lies at the bottom of the picture. . . The Law of Superposition of Strata does not apply to intrusive granite. In this step the beds are uplifted.
Erosion occurs at the top of the picture.
Material is removed from the top down and carried away from the picture area. Uplift keeps lifting the pile into the erosion zone. Note that several of the younger beds have been lost. Such irregularity is common but there are cases where erosion has produced a flat surface. New sediments shown in red at the top of the picture bury the old erosion surface and the strata below it.