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24-Jul-2020 02:19

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In the time scale of Lutgens & Tarbuck, the Quaternary Period is further divided into the Pleistocene Epoch from 1.8 to 0.01 Myr and the most recent Holocene Epoch from 0.01 Myr to the present.By the beginning of the Quaternary Period, most of the major plate tectonic movements which formed the North American continent had taken place, and the main modifications past that were those produced by glacial action and erosion processess. In the time scale of Lutgens & Tarbuck, the Neogene Period and the Paleogene Period below are combined and called the Tertiary Period.Very significant events in Earth’s history are used to determine the boundaries of the eras. The events that bound the periods are widespread in their extent but are not as significant as those which bound the eras.In the time scale above you can see that the Paleozoic is subdivided into the Permian, Pennsylvanian, Mississippian, Devonian, Silurian, Ordovician and Cambrian periods.Research publications would give error bars for such division dates – it is not implied here that these boundaries are known to 3 or 4 significant digits.The division of the geologic column into different periods is largely based upon the varieties of fossils found, taken as indicators of a time period in Earth’s history.

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Lutgens & Tarbuck take on the task of surveying Earth history in one chapter, Chapter 19 of Essentials of Geology.Very important events in the history of the world are used to determine the boundaries of the age.

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