Fossils are collected along with rocks that occur from the same strata.
There are several different methods for estimating the ages of fossils, including: Paleontologists rely on stratigraphy to date fossils.
Stratigraphy is the science of understanding the strata, or layers, that form the sedimentary record.
On the cover of your ESRT in the top left box you will find the Radioactive Decay Data for four isotopes which we will focus on.
Carbon 14 occurs naturally, and is absorbed by all living things when we eat and drink.
As the isotopes decay, they give off particles from their nucleus and become a different isotope.