Sediment spreads horizontality and it goes from youngest on top to oldest on bottom. when sediment deposits in water, it also spreads flat in all directions until it either runs out of material and pinches off or it hits a barrier. this is known as the

The process characterized by spreading the sediments horizontally, placing the youngest on top and the oldest to the bottom is called sedimentation. When the sediments deposit in water, it spreads flat in all directions until it runs out of material and pinches off or it hits a barrier.