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If an animal fossil is found, and the time during which it lived is known, it helps us understand the time period of any other fossil found in the same strata.Animals evolve rapidly, and these evolution's are reflected by the variations in their bones or teeth.Most of the soft tissues of the human body get decomposed with only the hard tissues left for research.These hard tissues include the teeth and the bones.It is composed of rocks and sediments deposited over millions of years. It is the evidence of Earth's history over such a long span of time.It is a perfect example of superposition (layers deposited one above the other) and lateral continuity (undisturbed and covering large distances).Strata is the layered arrangement or soil or rocks which lie parallel, one above the other.

Grand Canyon is a gorge located in Northern Arizona, USA. While some of the layers are uplifted, most of the landform is left undisturbed by nature.

Biostratigraphy: Layers get deposited above one another, over time, and fossils get trapped in these layers.

When we find two fossils in the same strata of soil, we assume that both fossils were deposited during the same time period.

Most of the nitrogen contained in these fossils gets depleted progressively.

Ground water percolates into these rocks and deposits its component elements such as fluorine, uranium, etc.

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