The Middle Pleistocene is a subseries of the Pleistocene Epoch in the international geologic timescale. It is equivalent in time to the Chibanian stage. The Chibanian name was officially ratified in January 2020. It is currently estimated to span the time between 0.7741 Ma and 0.129 Ma, also expressed as 774.1–129 ka. It includes the transition in palaeoanthropology from the Lower to the Middle Paleolithic over 300 ka.