Fossil

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.[1]

  1. Fossil: the remains or impression of a prehistoric plant or animal, usually petrified (turned into stone) while embedded in rock". Concise Oxford Dictionary, 9th ed.

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