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The matching rock layers were deposited at the same time, so they are the same age.Discover how geologists study the layers in sedimentary rock to establish relative age.They may cover very broad areas, especially if they formed at the bottom of ancient seas.Erosion may have worn away some of the rock, but layers on either side of eroded areas will still “match up.” Look at the Grand Canyon in Figure below. You can clearly see the same rock layers on opposite sides of the canyon.The method of reading the order is called stratigraphy (layers of rock are called strata).Relative dating does not provide actual numerical dates for the rocks.Relative age means age in comparison with other rocks, either younger or older.

relative dating of rocks worksheet-64

Throughout the history of life, different organisms have appeared, flourished and become extinct.In other words, fossil shells, bones, and teeth were never a part of a living creature! For Steno, the close resemblance between fossils and modern organisms was impossible to ignore.Instead of invoking supernatural forces to explain fossils, Steno concluded that fossils were once parts of living creatures.Now imagine that you come upon a formation like this: What do you think of it? How can you make any conclusions about rock layers that make such a crazy arrangement?Geologists establish the age of rocks in two ways: numerical dating and relative dating.But this explanation could not account for the fact that fossils were not only found on mountains, but also within mountains, in rocks that had been quarried from deep below Earth's surface.Seeking an alternate explanation, other writers proposed that the fossils had formed within the rocks as a result of mysterious forces. A process called relative-age dating helps scientists determine how old these rock layers are.Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence. As the layers build up, they cement together to form sedimentary rocks. This has also helped them to know how old the earth is. This simply means that sediments are usually deposited in horizontal layers.While it may seem obvious today, most people at the time did not believe that fossils were once part of living creatures.The reason was that the fossils of clams, snails, and other marine animals were found in tall mountains, miles from any ocean. Some religious writers believed that the shells were washed up during the Biblical flood.He then sought to explain how fossil seashells could be found in rocks far from any ocean.As in the Tyrannosaurus rex Figure 11.10, fossils resemble living organisms.




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