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The biostratigraphic expertise of TNO enables oil companies to fine-tune their geological models with accurate age and paleoenvironmental data.TNO has developed a number of innovative tools that demonstrably improve the effectiveness of biostratigraphy in hydrocarbon exploration.It is possible to calculate the age of a sample by measuring the uranium content and the density of the fission tracks.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.

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Sedimentary rocks are rarely useful for dating because they are made up of bits of older rocks.Argon then starts to re-accumulate at a constant rate in the newly formed rock that is created after the eruption.

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