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Igneous rocks are used in radiometric dating 99 of the time

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Can we date sedimentary rocks using radiometric dating techniques? Sedimentary rocks cannot be dated directly using radiometric dating, which is based on the idea that when rocks are in liquid form, their radiometric clock resets. This technique is generally used to date igneous and metamorphic rock, which are rocks that were once melted due to extreme heat and pressure. Radiometric dating determines how long ago the liquid rock solidified into solid rock. Sedimentary rock on the other hand consists of sedimentary particles which were removed and deposited somewhere else by some sort of fluid generally wind and water.
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Ringing rocks - Wikipedia

This is what archaeologists use to determine the age of human-made artifacts. But carbon dating won't work on dinosaur bones. The half-life of carbon is only 5, years, so carbon dating is only effective on samples that are less than 50, years old. Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old. 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, uranium and potassium, each of which has a half-life of more than a million years. Unfortunately, these elements don't exist in dinosaur fossils themselves.
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Geology 101: Physical Geology

The Radiometric Decay Equation A constant-rate process such as radioactive decay is described by the simple equation: In order to use this equation for decay over a given time period, we will need the solution of a first-order differential equation. Obtaining such a solution is beyond the scope and requirements of this class, though with years of calculus, you to could do the impossible. The equation above is known as the decay equation. It shows that at any time t, the number of parent atoms, N, is equal to the number of original parent atoms at time zero N0 gives the number of parent atoms at time zero , multiplied by the natural exponent raised to the negative power of the decay constant l multiplied by the time t.
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Are you sure you want to delete this answer? Yes Sorry, something has gone wrong. It provides an isotopic ratio.
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