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01-Dec-2015 22:09

geomagnetic stratigraphic dating-47

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Of especially great importance are the remains of minute organisms that are encountered in enormous quantities—such as foraminifers, radiolarians, nannoplankton, and diatoms.

Essentially all groups of fossils can be used for the purpose of stratigraphic correlation.

In addition, the term “erathem” replaced the term “group” in the sense of the deposits formed during an era.

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In the mid-20th century, the eonothem, which is the largest time-stratigraphic unit and corresponds to an eon of geologic time, was added to this system.Stratigraphy is based primarily on the capacity to trace strata of sedimentary rocks and on the investigation of faciès changes of the rocks in basins of past geologic epochs. In the first half of the 19th century, as a result of research carried out in various countries, stratigraphic systems were identified, and their sequence in the history of the earth was established. The uranium-thorium-lead age method is used to date zircons from effusive rocks.



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