Geological Time Chapter 4 Section 3 / 4 Radioactive Dating / Geologic Time Scale
The most widely known form of radiometric dating is carbon dating. This is what archaeologists use to determine the age of human-made artifacts. But carbon dating won't work on dinosaur bones. The half-life of carbon is only 5, years, so carbon dating is only effective on samples that are less than 50, years old. Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old.
To determine the ages of these specimens, scientists carbon 14 dating igneous rocks an isotope with a very long half-life. Some of the isotopes used for this purpose are uranium, uranium and potassiumeach of which has a half-life of more than a million years. Unfortunately, these elements don't exist in dinosaur fossils themselves. Each of them typically exists in igneous rock, or rock made from cooled magma.
Fossils, however, form in sedimentary rock -- sediment quickly covers a dinosaur's body, and the sediment and the bones gradually turn into rock. But this sediment doesn't typically include the necessary isotopes in measurable amounts. Fossils can't form in the igneous rock that usually does contain the isotopes. The extreme temperatures of the magma would just destroy the bones. So to determine the age of sedimentary rock layers, researchers first have to find neighboring layers of Earth that include igneous rock, such as volcanic ash.
These layers are like bookends -- they give a beginning and an end to the period of time when the sedimentary carbon 14 dating igneous rocks formed. By using radiometric dating to determine the age of igneous bracketsresearchers can accurately determine the age of carbon 14 dating igneous rocks sedimentary layers between them. Using the basic ideas of bracketing and radiometric dating, researchers have determined the age of rock layers all over the world.
This information has also helped determine the age of the Earth itself. While the oldest known rocks on Earth are about 3. Based on the carbon 14 dating igneous rocks of these samples, scientists estimate that the Earth itself is about 4. In addition, the oldest known moon rocks are 4. Since the moon and the Earth probably formed at the same time, this supports the current idea of the Earth's age. You can learn more about fossils, dinosaurs, radiometric dating and related topics by reading through the links on the next page.
Strange, Super and Surprising: Our Best Stories You Carbon 14 dating igneous rocks Have Missed This Week. Can You Be Addicted to Travel? Yellowstone Grizzly Bears Lose Endangered Species Protections. Do drone pilots train on video games? How Donating Your Body to Science Works. How do they deice airplanes? Does a wet summer mean carbon 14 dating igneous rocks brilliant fall?
Follow us Facebook YouTube Twitter Pinterest. Like HowStuffWorks on Facebook! How Stuff Works Science. HSW Science Environmental Science Earth Science Geology Paleontology. How do scientists determine the age of dinosaur bones? An eagle flies over the Grand Canyon in Arizona, April 5, You can see the layers of sedimentary rock.
Radiometric dating isn't the only method of determining the age of rocks. Other techniques include analyzing amino acids and measuring changes in an object's magnetic field. Scientists have also made improvements to the standard radiometric city dating bristol. For example, by using a laser, researchers can measure parent and daughter atoms in extremely small amounts of matter, making it possible to determine the age of very small samples [source: What's the archaeological method?
What is the oldest fossil ever found? How Sand Dunes Work. Which of today's animals lived alongside dinosaurs? What can we learn from urban archaeology? About Shows Privacy Ad Choices Terms. Store Advertising Careers Contact Us Help. Keep up to date on: Testing this long verbose error message to check the behaviour.