Potassium 40 dating rocks

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Available samples of oceanic basalt have all proved to be young.

In those cases where carbonate sedimentary rock overlies the basalt, the carbonate deposition occurred shortly after the formation of the volcanic mountain or basaltic floor.

Fine-grained whole rocks, particularly of mafic varieties, may also have 100 % retentivity under suitable conditions.Unfortunately, these elements don't exist in dinosaur fossils themselves.Each of them typically exists in igneous rock, or rock made from cooled magma.To determine the ages of these specimens, scientists need an isotope with a very long half-life.Some of the isotopes used for this purpose are uranium-238, uranium-235 and potassium-40, each of which has a half-life of more than a million years.

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