Sediments derived from the remains of the hard parts of once-living organisms are called sediments.

fossils

Explanation:

When an organism dies, its remains decompose and disintegrate rapidly by the action of bacteria, other animals, wind, rain, or sea waves. But if that corpse is buried in a short time by sediments, and it is safe from the intervention of biological and mechanical agents, the chances of fossilization increase greatly. Obviously it is much simpler than hard parts such as shells and bones, than soft parts such as muscles and viscera that despite their burial remain exposed to the action of bacteria. It all depends on how tight the protective envelope that surrounds the body. In exceptional cases those soft parts are also preserved, and exquisitely preserved insects have been found in amber, which is a fossil resin of trees, vertebrates in asphalt mines, or frozen mammoths in the Siberian peat.

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