what are ways that rock units in two different stratigraphic sections are correlated?

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26-10-2022
Geography

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what are ways that rock units in two different stratigraphic sections are correlated?

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kjuli1766 kjuli1766 · Answer 1 · 2022-10-29T10:15:49+02:00

Rock units can also be related based on color mineral composition chemical composition sedimentary structure and other criteria.

Each of the rock entities must have something special to relate to each other. This could be an index fossil a unique rock type a keybed or a unique set of rocks. A keybed can be global. An example is the iridium layer deposited during the Cretaceous-Tertiary extinction. The most basic concept used in relative dating is the law of superposition.

Simply put, each bed of a series of sedimentary rocks is younger than the lower bed and older than the upper bed. Matching rock formations with fossils is useful for geologists. Because without fossils in rock formations, we can't know much about animals from that period. They help geologists associate layers of sedimentary rock. Purpose Observation of rock formations at various locations will help construct the geological history of the region.

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