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When minerals get subducted into the Earth and come back as volcanic magmas or ash, this essential re-sets the radiometric clock back to zero and therefore a reliable age date is possible.Sedimentary rocks may have radioactive elements in them, but they have been re-worked from other rocks, so essentially, there radiometric clock has not been re-set back to zero.The half-life of a radioactive element is the time required for half the isotope to decay to form the stable daughter isotope.

According to the Smithsonian Institute, using radiodating of sedimentary rock tells the date of formation of the original igneous rock, which, through the processes of weathering and erosion, formed the layers of the sedimentary rock.Fossils include the belemnite Belemnopsis aucklandica. Which dating method is best for rocks with fossils in?Layer 2: Mudstone – sediments laid down in deep water. Which dating method is best for rocks with fossils in?Although they had no way to measure the exact age of a rock, they were able to figure out by simple observation that some rocks were higher or lower on the geological column that others.From this they were able to deduce that the lower rocks were generally older than the higher rocks.

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