However, this is mainly applicable to an undisturbed arrangement of rocks.Most of the rock arrangements are disturbed by natural forces, such as wind and water, which result in unconformity in the sequence of rocks.When they die, their remains get fossilized and are used by scientists to determine the era in which they lived.These fossils are then used as standards to determine the age of other fossils. An example can be fossils of some species of monkeys found alongside fossils of human species.Biostratigraphy: Layers get deposited above one another, over time, and fossils get trapped in these layers.
Each layer has a unique layer and consists of different sediments or material.
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).
In case of a difference in the fluorine content, they are considered to be from different eras. It is an in-depth analysis in all the possible ways, taking into account all the related complexities.
In anthropology, the study of humans living in the prehistoric era is done by collecting the data of human fossils found during excavations or research.