Each piece of writing contains multiple layers and meanings.

The mound contains several layers attesting to its habitation throughout the ages.

This was due to the riverbed containing layers of iron ore.

The film also contains several additional layers, however.

He had never been known to underestimate an enemy, and his schemes always contained layers of contingency plans.

Columbus Crater is one of many craters that contain layers.

The structure contains several layers that all have separate functions.

It was constructed over a longer period of time, and contains different layers of writing.

For example, a thick texture contains several different "layers" of instruments.

Many songs contain multiple layers of meaning, and can be interepreted as social or political commentary.