Simple definition relative dating
Many of these organisms have left their remains as fossils in sedimentary rocks.
Geologists have studied the order in which fossils appeared and disappeared through time and rocks. Fossils can help to match rocks of the same age, even when you find those rocks a long way apart.
There lay your relative on his back behind the curtain, plunged in sweet slumber.
Radiometric dating (often called radioactive dating) is a way to find out how old something is.
Correlation can involve matching an undated rock with a dated one at another location.
Suppose you find a fossil at one place that cannot be dated using absolute methods.
This helps to counter the effects of heating and squeezing, which a rock may experience in its long history.
Different dating methods may be needed to confirm the age of a sample.
Do you know, sir, that I am the friend and relative of that sick gentleman?
Fossils may be dated by taking samples of rocks from above and below the fossil's original position.
Radiometric dating is also used to date archaeological materials, including ancient artifacts.
The method compares the amount of a naturally occurring radioactive isotope and its decay products, in samples. It is the main way to learn the age of rocks and other geological features, including the age of the Earth itself.
It may be used to date a wide range of natural and man-made materials.