Fossil relative dating activity dating dilbert attractive

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Geologists still use the following principles today as a means to provide information about geologic history and the timing of geologic events.The principle of Uniformitarianism states that the geologic processes observed in operation that modify the Earth's crust at present have worked in much the same way over geologic time.The Law of Superposition, which states that older layers will be deeper in a site than more recent layers, was the summary outcome of 'relative datin g' as observed in geology from the 17th century to the early 20th century.The regular order of the occurrence of fossils in rock layers was discovered around 1800 by William Smith.

Photo from Glen Canyon National Recreation Area, Utah.The Permian through Jurassic stratigraphy of the Colorado Plateau area of southeastern Utah is a great example of Original Horizontality and the Law of Superposition, two important ideas used in relative dating.These strata make up much of the famous prominent rock formations in widely spaced protected areas such as Capitol Reef National Park and Canyonlands National Park.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.

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A similar situation with igneous rocks occurs when xenoliths are found.

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