What is Fossil (Simplified Paleontology)

Fig. Time Period Of Fossilisation

Fossils are the Remains of plant and animals
that have been preserved in rock.

A fossil may be the preserved remains of an organism itself, an impression of it in rock, or preserved traces (known as trace fossils) left by an organism while it was alive, such as organic carbon outlines, fossilized footprints, or droppings. 

Significance Of Fossilisation

• When an organism died then it soon rot away or are eaten by scavengers.
• For fossilisation to occur, rapid burial by sedimentation is necessary.
• The organism decays,but the harder parts - bones,teeth and shells ,for example - may be preserved and hardened by minerals from the surrounding sedimentation.
• Fossilisation may also occur even when the hard parts of an organism are dissolved away to leave an impression called a mould. 
• The mould is filled by minerals, thereby creating a cast of organism. 
• The study of fossils (paleontology) can not only show how living things have evolved, but can also help to reveal the earth's geological history - for example, by aiding in the dating of rock strata.

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