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Biostratigraphic dating relies on


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At the end of the eighteenth century, geologists still had a confused perception of the rocks they studied. But geologists had great difficulty reconstructing the original order of the layers by looking at the surviving rock. That began to change around , thanks in large part to an obscure British canal surveyor named William Smith above left. Smith was able to correlate rock layers all over England based on characteristic fossils within the layers. Click to see how the layers formed. Relative dating of rocks using fossils Smith, who had little formal education, traveled throughout England as a surveyor and spent six years supervising the digging of the Somerset Canal in southwestern England. Along the way he became well acquainted with the rocks through which he cut the canals. He was surprised to find that the fossils in the layers often were arranged in the same distinctive order from the bottom to the top of the rocks. And as he traveled across England, he discovered the same sequences of fossils in rock layers.

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Biostratigraphy is the branch of stratigraphy which focuses on correlating and assigning relative ages of rock strata by using the fossil assemblages contained within them. Usually the aim is correlation, demonstrating that a particular horizon in one geological section represents the same period of time as another horizon at some other section. The fossils are useful because sediments of the same age can look completely different because of local variations in the sedimentary environment. For example, one section might have been made up of clays and marls while another has more chalky limestones , but if the fossil species recorded are similar, the two sediments are likely to have been laid down at the same time.

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Relative Techniques. In the past, relative dating methods often were the only ones available to paleoanthropologists. As a result, it was difficult to chronologically compare fossils from different parts of the world. However, relative methods are still very useful for relating finds from the same or nearby sites with similar geological histories. The oldest and the simplest relative dating method is stratigraphy , or stratigraphic dating. It is based on the principle of superposition , which is that if there are layers of deposits, those laid down first will be on the bottom and those laid down last will be on the top.

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Biological Anthropology Exam 3 Terms Flashcards

The age of fossils can be determined using stratigraphy, biostratigraphy, and radiocarbon dating. Paleontology seeks to map out how life evolved across geologic time. A substantial hurdle is the difficulty of working out fossil ages. There are several different methods for estimating the ages of fossils, including:. Paleontologists rely on stratigraphy to date fossils.

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