讨论:第四纪
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—PalaeoMal (留言) 2009年7月28日 (二) 09:14 (UTC)
Redefinition and base of Quaternary and Pleistocene
Excuse me for writing in English. I received the following message from a colleague. I suggest (if still necessary) the relevant pages should be modified accordingly:
Dear Quaternary colleague,
The International Union of Geological Sciences (IUGS ) has recently ratified to redefine the base of the Quaternary and Pleistocene at 2.6 Ma (see below). The end of a long lasting battle?
REDEFINITION OF THE BASE OF QUATERNARY SYSTEM/PERIOD, AND OF THE BASE OF THE PLEISTOCENE SERIES/EPOCH
The IUGS Executive Committee has ratified a request from the IUGS International Commission on Stratigraphy (ICS) regarding the definition of the base of Quaternary System/Period (and top of the Neogene System/Period), and redefinition of the base of the Pleistocene Series/Epoch (and top of the Pliocene Series/Epoch). The ICS submitted for IUGS ratification its recommendation that:
1) the base of the Pleistocene Series/Epoch be lowered such that the Pleistocene includes the Gelasian Stage/Age and its base is defined by the Monte San Nicola GSSP, which also defines the base of the Gelasian;
2) the base of the Quaternary System/Period, and thus the Neogene-Quaternary boundary, be formally defined by the Monte San Nicola GSSP and thus be coincident with the bases of the Pleistocene and Gelasian; and
3) with these definitions, the Gelasian Stage/Age be transferred from the Pliocene Series/Epoch to the Pleistocene.
More information on the subject can be found on our website: http://www.geo.uu.nl/inqua-nl/ or on http://www.quaternary.stratigraphy.org.uk/ Kind regards,
JS On behalf of INQUA-Netherlands