Stratigraphy - the study of layered sedimentary rocks and how they were deposited.

They passed by a series of layered rocks.

It was formed in and subsequently covered by layered rocks, from beneath which it is now being exhumed.

It is primarily used in the study of sedimentary and layered volcanic rocks.

It slammed against the lower wall, ricocheted and swirled up, licking the layered rocks.

The canyon itself was a broad chasm, a semicircle of layered rock that widened as it rose.

It has been described as a land of layered, flat-lying sedimentary rock.

Some locations on the Red Planet show groups of layered rocks.

The central uplift of Oudemans exposes layered rock that may be sedimentary.