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Three small ammonite fossils, each about 1.5 cm across
A fossil of a trilobite which lived about 444 million years ago
Lower Proterozoic stromatolites from Bolivia, South America. These were produced by cyanobacteria. Polished vertical slice through rock
A mosquito and a fly trapped in amber
Fossil locust from the earliest Upper Cretaceous, ~95 million years ago, Santana Formation, Brazil

A fossil is the remains or trace of an ancient living thing.

Fossils of animals, plants, or protists occur in sedimentary rock.

In a typical fossil, the body form is retained, but the original molecules that made up the body have been replaced by some inorganic material, such as calcium carbonate (CaCO3) or silica (SiO2). The fossil feels like, and is, made of rock. It has been mineralised or petrified (literally, turned into rock).  view more...