The Pleistocene is a geologic epoch within the Quaternary Period, spanning roughly 2.58 million to 11,700 years ago, characterized by repeated glacial–interglacial cycles driven by orbital (Milankovitch) forcing and associated feedbacks in the climate system. It encompasses major expansions of continental ice sheets in the Northern Hemisphere, large sea-level fluctuations, and pronounced shifts in atmospheric composition and global temperature. Stratigraphically, its base is defined near the Gauss–Matuyama magnetic reversal, and its end is marked by the transition to the Holocene following the last glacial termination. The Pleistocene is critical for understanding late Cenozoic climate dynamics and associated environmental changes.
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