More from this author. 1  Largest World Cities: 2014. 2  World Urban Areas Population and Density: A 2012 Update. 3  Largest Cities in the World: 2016. 4  Largest 1,000 Cities on Earth: World Urban Areas: 2015 Edition. 5  The Costs of Smart Growth Revisited: A 40 Year Perspective.
Definition of fossil. 1  1 : a remnant, impression, or trace of an organism of past geologic ages that has been preserved in the earth's crust â compare living fossil. 2  2a : a person whose views are outmoded : fogyb : something (such as a theory) that has become rigidly fixed.
1 A fossil is a preserved remnant or trace of a once living organism. 2  Fossils are typically found in sedimentary rocks. 3  Usually it is the âhard partsâ of plants and animals that are preserved e.g. wood or bones or shells, as the âsofter partsâ e.g. flesh are usually decayed (decomposed by bacteria, etc.) or eaten.