Kalmar "Glacial Epoch" tana nufin wani lokaci a tarihin Duniya, wanda kuma aka sani da shekarun kankara, lokacin da glaciers da zane-zanen kankara suka bazu a manyan wurare na duniya. Waɗannan lokutan suna da yanayin yanayin sanyi na duniya, kuma galibi ana yin alama ta gaba da ja da baya na glaciers, da kuma samuwar da kuma narkewar zanen kankara. Pleistocene Epoch, wanda ya dade daga kimanin miliyan 2.6 zuwa shekaru 11,700 da suka gabata kuma an san shi da tsananin glaciation. A wannan lokacin, yawancin Arewacin Amirka, Turai, da Asiya sun kasance cikin ƙanƙara, kuma matakan teku sun yi ƙasa sosai fiye da yadda suke a yau.