The Pleistocene is the Quaternary epoch preceding the Holocene, approximately to million years ago.[ref]
International Chronostratigraphic Chart by International Commission on Stratigraphy (2026-06). Pleistocene row
Marine oxygen isotope ratios provide evidence of changing ice volume and deep-water temperature across this interval; combining many sediment-core records reduces local noise but still requires an age model.[ref]A Pliocene-Pleistocene stack of 57 globally distributed benthic oxygen-isotope records by Lorraine E. Lisiecki and Maureen E. Raymo. Abstract: globally distributed isotope stack and age-model construction
Agriculture is not the official definition of the age. But it is good enough. Likely related to the official end of glaciations thing.
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