Carbon dating age fossil
This would be the estimated age of the earliest life or fossils. Uranium 238 is only found igneous or volcanic rocks. Because of the huge differences in the half lives of Carbon 14 and Uranium238 that cannot be used together.
There are some rare places where a whole animal can be preserved.
The remains are then covered in sediment, or layers of sand and mud.
Over time the soft parts of the animal decay, leaving only the harder parts like teeth and bones.
Uranium 238 can only be used to date volcanic rocks of a very old age.
Fossils are the remains of animals or plants that lived a long time ago.