At one time a dark layer covered the whole area, now only a few pieces remain as buttes.

Ripple marks are common in the upper members of this dark brown thin-bedded layer.

The darkest layer is the forest floor where most of the larger animals live.

The images lay in dark layers still, at the back of his mind.

Another possibility is that the impactor may have punched through the bright surface to reveal a dark layer beneath.

A dark layer at the top forms a cap rock that protects the underlying layers from erosion.

The roiling clouds up there sometimes parted to show darker layers above.

The top half of the body was a charred mass, clothes plastered into a dark layer.

It was as he had feared, in the deepest darkest layer of his subconscious.

Shadows lay over everything in dark layers of musty velvet.