The age of the carbon in the rock is different from that of the carbon in the air and makes carbon dating data for those organisms inaccurate under the assumptions normally used for carbon dating.
This restriction extends to animals that consume seafood in their diet.
This technique is not restricted to bones; it can also be used on cloth, wood and plant fibers.
Third, evolution of living organisms into more advanced life forms by natural selection or mutations.
The Washington Post article Scientists discover hundreds of footprints left at the dawn of modern humanity describes the geological dating of stratified layers of mud by analyzing and dating minerals within each layer.
But since floods jumble materials of different origins and ages together, that meant the scientists had to date dozens of different minerals.
Radiometric dating is a means of determining the "age" of a mineral specimen by determining the relative amounts present of certain radioactive elements.
By "age" we mean the elapsed time from when the mineral specimen was formed.