Radiometric dating and carbon dating of fossils
For example, say a fossil is found that has 35% carbon 14 compared to the living sample. We can use a formula for carbon 14 dating to find the answer.Where t is the age of the fossil (or the date of death) and ln() is the natural logarithm function.The stable form of carbon is carbon 12 and the radioactive isotope carbon 14 decays over time into nitrogen 14 and other particles.Carbon is naturally in all living organisms and is replenished in the tissues by eating other organisms or by breathing air that contains carbon.Lava flows from active volcanos in Hawaii have given dates as old as 27 million years.Radioactive material can be eroded away changed by heat and chemical reactions. When the radioactive date contradicts the relative age as determined by the fossils the fossil date is always considered to be the better value.The vast majority of fossils are found in sedimentary rocks.
So, the fossil is 8,680 years old, meaning the living organism died 8,680 years ago.
No geologist uses radioactive dating to do more than confirm dates established by the fossils using Darwin's theory of descent with modification.
Archaeologists use the exponential, radioactive decay of carbon 14 to estimate the death dates of organic material.
radiometric dating can not be used to date fossils. Most fossils do not contain Carbon so Carbon 14 radiometric dating can not be used to date a fossil that does not contain Carbon. There is not enough Carbon 14 left to used for radioactive dating.
( approximately) This means in 10 half lives 57,000 years.