Discussion
Which Global Stratigraphic Section and Point (GSSP) stage boundary is marked in a speleothem ?
Answer: B
The stage boundary marked in a speleothem is the base of the Meghalayan stage.
The Meghalayan, the latest stage of the Holocene, begins at 4,200 years before 2000 CE with an abrupt drying event. Its GSSP, ratified in 2018, is defined in a stalagmite from Mawmluh Cave in Meghalaya, India, the first GSSP placed in a speleothem.
The Northgrippian GSSP is in the NorthGRIP ice core from Greenland, while the Gelasian and Zanclean GSSPs are in marine sedimentary sections in Sicily, so none of them is in a cave deposit.
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