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Relative dating characteristics

This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. July Thermoluminescence[ edit ] Thermoluminescence testing also dates items to the last time they were heated. This technique is based on the principle that all objects absorb radiation from the environment.
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Australopithecus | Characteristics & Facts |

Are you sure you want to delete this answer? Yes Sorry, something has gone wrong. Well, I gave up on relative dating when my cousins started spreading rumors about me Relative dating is done by comparing the locations of the items being dated. If you look at a building, relative dating allows you to say that the first floor was built before the top floor. If you look at an archeological dig, you can say that, in general, the dirt and rock on the surface are younger than the dirt and rock and items beneath them and that the deeper you dig, the older the items you're looking at. If you look at a series of fossils, say shells or mammal bones, you may be able to see the development of structures that give an indication of which fossils are older.
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Geology[ edit ] The regular order of the occurrence of fossils in rock layers was discovered around by William Smith. While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers. As he continued his job as a surveyor , he found the same patterns across England. He also found that certain animals were in only certain layers and that they were in the same layers all across England. Due to that discovery, Smith was able to recognize the order that the rocks were formed.
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April Koch April teaches high school science and holds a master's degree in education. Discover how geologists study the layers in sedimentary rock to establish relative age. Learn how inclusions and unconformities can tell us stories about the geologic past. We'll even visit the Grand Canyon to solve the mystery of the Great Unconformity!
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