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Rock strata dating

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Relative dating

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. Sixteen years after his discovery, he published a geological map of England showing the rocks of different geologic time eras. Principles of relative dating[ edit ] Methods for relative dating were developed when geology first emerged as a natural science in the 18th century. Geologists still use the following principles today as a means to provide information about geologic history and the timing of geologic events. Uniformitarianism[ edit ] 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.

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Scientific measurements such as radiometric dating use the natural radioactivity of certain elements found in rocks to help determine their age. Scientists also use direct evidence from observations of the rock layers themselves to help determine the relative age of rock layers. Specific rock formations are indicative of a particular type of environment existing when the rock was being formed. For example, most limestones represent marine environments, whereas, sandstones with ripple marks might indicate a shoreline habitat or a riverbed. The study and comparison of exposed rock layers or strata in various parts of the earth led scientists in the early 19th century to propose that the rock layers could be correlated from place to place. Locally, physical characteristics of rocks can be compared and correlated.

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Present day geologic processes have operated throughout geologic time. The geologic timescale is a chronology calendar of events on Earth based on obtaining ages of past events. These ages have been derived from relative dating and absolute dating radiometric dating of rock layers and fossils. Field geologists' rely on a number of simple techniques for dating rocks and constructing geological successions. Underpinning this are four key concepts:

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Geological Dating -Determining rock strata by geological composition

Many things on our planet, such as the formation of mountains, or the draining of lakes by rivers, take millions of years. The creation of life on earth and the extinction of life on earth has happened many times over. Scientists have documented at least 5 mass extinctions. Geological Dating -Determining rock strata by geological composition -Using depth to determine relative age -Predicting natural events by strata 2 What is Geological Dating? It is how scientists can determine the relative age of rocks and fossils.

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