Discussion
Which stratigraphic 'Global stratotype section and point' boundary is marked in an 'Ice-Core' of the Northern Green land.
Answer: D
The boundary is the Pleistocene-Holocene boundary.
In 2008 the International Commission on Stratigraphy ratified the base of the Holocene with a Global Stratotype Section and Point in the NorthGRIP ice core from central Greenland, at a depth of 1,492.45 m. It is dated to 11,700 years before AD 2000 and marked by an abrupt change in deuterium excess and other proxies at the end of the Younger Dryas cold event. It is the only GSSP defined in an ice core.
The Permian-Triassic GSSP is at Meishan in China, and the Miocene-Pliocene and Pliocene-Pleistocene GSSPs are rock sections in Mediterranean countries. All of these are far too old for any ice core, which reaches back less than a million years.
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