Difference between relative dating and radiometric dating

Radiometric dating: This technique solely depends on the traces of radioactive isotopes found in fossils.

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

This Buzzle post enlists the differences between the absolute and relative dating methods.

Geological specimens that are unearthed need to be assigned an appropriate age.

Cross dating: This method compares the age of remains or fossils found in a layer with the ones found in other layers.

The comparison helps establish the relative age of these remains.

Dendrochronology: Each tree has growth rings in its trunk.

This technique dates the time period during which these rings were formed.

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There are two main methods determining a fossils age, relative dating and absolute dating.

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.

Biostratigraphy: An extended version of stratigraphy where the faunal deposits are used to establish dating.

Faunal deposits include remains and fossils of dead animals.

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