A relict sediment is an area of ancient sediment which remains unburied despite changes in the surrounding environment.

For their good reservoir properties, ancient glacially-related sediments have been targeted by oil industries.

Dolphin history is revealed by fossils from ancient marine sediments now exposed on land.

Similar deposits have been recognised in ancient sediments.

The metamorphic rock surface was created by the transformation of ancient sediments under intense heat and pressure during mountain-building processes.

This has shown that the two areas produce distinctive mineral suites that can be used to trace the source of ancient sediments.

Now they were seeing an expanse of open desert with faint dunelike ripples, loose dust on ancient, hard sediments.

The geology is ancient sediments, not like Mars City.

Knorr and its long-corer will allow scientists to sample deep, ancient sediments that are rich with historical information about the ocean and climate.

Since then the stream has continued to deepen the gorge through underlying rock to ancient sediments deposited in a sea more than 400 million years ago.