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By — Own work, Public Domain, The principle of superposition In a series of undisturbed layered rocks each successive layer above is younger than the layer below it.

If you find them at an angle, they have been moved• What happened to these layers of rock if anything? Therefore if horizontal strata are dissected by erosional features, such as a valley, they can be interpreted to be the same strata.

Question: Name: RELATIVE DATING WORKSHEET Principles of Geology• Sedimentary rocks can contain clasts of other rocks such as pebbles in a conglomerate , or igneous rocks can contain xenoliths foreign rock fragments; figure below which were ripped from surrounding rocks by the magma.

This shows that there is a disconformity between sedimentary rocks C and E.

The principle of lateral continuity Sediments are deposited laterally in continuous layers.

The time that could have been represented by such layers is instead represented by the disconformity.

These rock strata have been barely disturbed from their original deposition, except by a broad regional uplift.

However, near the bottom horizontal strata overlie tilted strata.