|Subdivisions of the Quaternary System|
The Early Pleistocene (also known as the Lower Pleistocene) is an unofficial sub-epoch in the international geologic timescale or a sub-series in chronostratigraphy, being the earliest (or lowest) division of the Pleistocene Epoch/Series within the ongoing Quaternary Period/System. It is currently estimated to span the time between 2.580 ± 0.005 Ma (million years ago) and 0.773 ± 0.005 Ma. The Early Pleistocene has two sub-divisions, the Gelasian (to 1.800 ± 0.005 Ma) and the Calabrian.
While the Gelasian and the Calabrian have officially been defined by the International Union of Geological Sciences (IUGS) to effectively constitute the Early Pleistocene, the succeeding Chibanian and Tarantian stages have yet to be ratified. These proposed stages are unofficially termed the Middle and Late Pleistocene divisions respectively. The Chibanian provisionally spans time from 773 ka to 126 ka, and the Tarantian from then until the definitive end of the whole Pleistocene, c. 9700 BC in the 10th millennium BC.
- Cohen, K. M.; Finney, S. C.; Gibbard, P. L.; Fan, J.-X. (May 2019). "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. Retrieved 13 November 2019.
- Mike Walker & others (14 June 2018). "Formal ratification of the subdivision of the Holocene Series/Epoch (Quaternary System/Period)" (PDF). Subcommission on Quaternary Stratigraphy (SQS). Retrieved 11 November 2019. Cite journal requires
|journal=(help) This proposal on behalf of the SQS has been approved by the International Commission on Stratigraphy (ICS) and formally ratified by the Executive Committee of the International Union of Geological Sciences (IUGS).
- P. L. Gibbard (17 April 2015). "The Quaternary System/Period and its major sub-divisions". ScienceDirect. Elsevier BV. pp. 686–688. Retrieved 13 November 2019.
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