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This technique is, however, useful for providing relative dates for objects found at the same site.Another useful chemical analysis technique involves calculating the amount of nitrogen within a bone.Knowing when a dinosaur or other animal lived is important because it helps us place them on the evolutionary family tree.Accurate dates also allow us to create sequences of evolutionary change and work out when species appeared or became extinct. These are: Where possible, several different methods are used and each method is repeated to confirm the results obtained and improve accuracy.This relatively new technique was developed in order to achieve more accurate dates than those obtained from the potassium-argon method.The older method required two samples for dating and could produce imprecise dates if the argon was not fully extracted.Only one sample is required for this method as both the argon-39 and argon-40 can be extracted from the same sample.

Uranium is present in many different rocks and minerals, usually in the form of uranium-238.Buried bones absorb chemicals, such as uranium and fluorine, from the surrounding ground and absorb more of these chemicals the longer they remain buried.The rates of absorption depend on a number of factors which are too variable to provide absolute dates.The age of volcanic rocks and ash can be determined by measuring the proportions of argon (in the form of argon-40) and radioactive potassium within them.Each volcanic eruption produces a new deposit of ash and rock.

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