fossils are preserved parts of dead organisms. This is the impression of once-living organisms on the earth. Examples of fossils are animal bones, shells, stone imprints, cast molds, etc. Paleontology is the study of fossils.

The most common method of fossilisation is petrification through a process called permineralisation.

As it get more deeper in soil more we get the age

Paleontology is the study of fossils and Archaeology is the scientific study of human-made artifacts and structures to learn about ancient people and cultures.

Fossil molds and casts preserve a three-dimensional impression of remains buried in sediment. The mineralized impression of the organism left in the sediment is called a mold.

Fossils are never found in igneous rocks because igneous rocks are formed directly from lava or magma, not sediment.

Fossil fuels are derived from the burial of photosynthetic organisms, including plants on land (which primarily forms coal) and plankton in the oceans (which primarily forms oil and natural gas). While buried, this carbon is removed from the carbon cycle for millions of years to hundreds of millions of years.

index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment.