Younger Dryas
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The Younger Dryas, which occurred circa 12,900 to 11,700 years Before Present (BP), was a stadial (cooling) event which marked a return to glacial conditions, temporarily reversing the climatic warming of the preceding Late Glacial Interstadial. The Younger Dryas was the most severe and longest lasting of several interruptions to the warming of the Earth's climate. The end of the Younger Dryas marks the beginning of the current Holocene epoch.
Evolution of temperatures in the postglacial period, after the Last Glacial Maximum, showing very low temperatures for the most part of the Younger Dryas, rapidly rising afterwards to reach the level of the warm Holocene, based on Greenland ice cores.
This image shows temperature changes, determined as proxy temperatures, taken from the central region of Greenland's ice sheet during the Late Pleistocene and beginning of the Holocene.
Holocene
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The Holocene is the current geological epoch, beginning approximately 11,700 years ago. It follows the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene is an interglacial period within the ongoing glacial cycles of the Quaternary, and is equivalent to Marine Isotope Stage 1.
Holocene cinder cone volcano on Utah State Route 18 near Veyo
Bronze bead necklace, Muséum de Toulouse