Any part of a previous rock layer, like a piece of stone, is older than the layer containing it.

Any feature that cuts across rock layers is younger than the layers

Sediments are originally deposited in horizontal layers.

Sedimentary layers or lava flows extend sideways in all directions until they thin out or reach a barrier.

In some rock formations, layers or parts of layers may be missing. This is often due to erosion. Erosion by water or wind removes sediment from exposed surfaces. Erosion often leaves a new flat surface with some of the original material missing

In undisturbed rock layers, the oldest layer is at the bottom and the youngest layer is at the top.

Relative Dating uses

The oldest rocks are usually found on the

Erosion

Relative Dating can tell you

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