Dating rocks and fossils and geologic events dating website template monster
It can only be used to date fossils younger than about 75,000 years.
Potassium-40 on the other hand has a half like of 1.25 billion years and is common in rocks and minerals.
The same rock formation also contains a type of trilobite that was known to live 415 to 425 million years ago.For example if you have a fossil trilobite and it was found in the Wheeler Formation.The Wheeler Formation has been previously dated to approximately 507 million year old, so we know the trilobite is also about 507 million years old.The universe is full of naturally occurring radioactive elements.
Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms." When molten rock cools, forming what are called igneous rocks, radioactive atoms are trapped inside. By measuring the quantity of unstable atoms left in a rock and comparing it to the quantity of stable daughter atoms in the rock, scientists can estimate the amount of time that has passed since that rock formed.While people are most familiar with carbon dating, carbon dating is rarely applicable to fossils.