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Dendrochronology: Each tree has growth rings in its trunk.
This technique dates the time period during which these rings were formed.
Fossils are important for working out the relative ages of sedimentary rocks.
Throughout the history of life, different organisms have appeared, flourished and become extinct.
Stratigraphy: The oldest dating method which studies the successive placement of layers.
It is based on the concept that the lowest layer is the oldest and the topmost layer is the youngest.
Whereas, relative dating arranges them in the geological order of their formation.
Thermoluminescence: It determines the period during which certain object was last subjected to heat.
It is based on the concept that heated objects absorb light, and emit electrons. A Venn diagram depicts both dating methods as two individual sets.
This Science Struck post enlists the differences between the absolute and relative dating methods.
Geological specimens that are unearthed need to be assigned an appropriate age.