Radiometric dating uses what isotopes
Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages.Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it.The atoms in some chemical elements have different forms, called isotopes.These isotopes break down at a constant rate over time through radioactive decay.Absolute dating is used to determine a precise age of a rock or fossil through radiometric dating methods.This uses radioactive minerals that occur in rocks and fossils almost like a geological clock.
Then after another 5,000 years half of the remaining parent isotope will have decayed.
But, how can we determine how old a rock formation is, if it hasn’t previously been dated?
Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.
By measuring the ratio of the amount of the original (parent) isotope to the amount of the (daughter) isotopes that it breaks down into an age can be determined.
We define the rate of this radioactive decay in half-lives.