What do upward-fining layers in a point bar indicate?

Correct answer: Gradual deposition during meander migration

Correct answer: D. A point bar forms on the inner side of a meander bend, where flow is slower and sediment is deposited. As the bar grows or as individual floods lose energy, larger and heavier grains tend to settle before smaller, lighter grains. A vertical succession that becomes finer upward can therefore record progressive deposition under decreasing or changing flow energy. During meander migration, the inner bank receives deposition while the outer bank is eroded, so D is correct. A is a coastal process involving a rock stack, B is erosion by moving glacier ice, and C is a karst mass-movement process. None explains point-bar sedimentation. Memory cue: inner bend builds, outer bend cuts; point bars commonly become finer upward.