Aspects of this topic are discussed in the following places at Britannica.
...into two epochs, the Pleistocene and the Holocene, with the Pleistocene (and therefore the Quaternary) understood to have begun some 1.8 million years ago. In 1948 a decision was made at the 18th International Geological Congress (IGC) in London that the base of the Pleistocene Series should be fixed in marine rocks exposed in the coastal areas of Calabria in southern Italy. As ratified by...
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