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Unformatted text preview: i.e. the upper boundary). The proposed section is the North Greenland Ice Core Project ice core 75 06' N 42 18' W.  The lower boundary of the Pleistocene Series is formally defined magnetostratigraphically as the base of the Matuyama (C2r) chronozone , isotopic stage 103. Above this point there are notable extinctions of the calcareous nanofossils : Discoaster pentaradiatus and Discoaster surculus .   The Pleistocene covers the recent period of repeated glaciations. The name Plio-Pleistocene has in the past been used to mean the last ice age. The revised definition of the Quaternary , by pushing back the start date of the Pleistocene to 2.58 Ma, results in the inclusion of all the recent repeated glaciations within the Pleistocene...
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- Fall '10