How does absolute dating work

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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.

Absolute dating, also called numerical dating, arranges the historical remains in order of their ages.

Whereas, relative dating arranges them in the geological order of their formation.

Relative techniques are of great help in such types of sediments.➤ It determines if an object/event is younger or older than another object/event from history.➤ Relative dating is qualitative.➤ This technique helps determine the relative age of the remains.➤ It is less specific than absolute dating.➤ Relative dating is comparatively less expensive and time-efficient.➤ It works best for sedimentary rocks having layered arrangement of sediments.

The rate of decay of these elements helps determine their age, and in turn the age of the rocks.

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.

Fluorine dating: Bones from fossils absorb fluorine from the groundwater.

The amount of fluorine absorbed indicates how long the fossil has been buried in the sediments.➤ It determines the age of a rock/object using radiometric techniques.➤ Absolute dating is quantitative.➤ This technique helps determine the exact age of the remains.➤ It is more specific than relative dating.➤ Absolute dating is expensive and time-consuming.➤ It works best for igneous and metamorphic rocks.

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