Definition : Younger Dryas
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What does YD mean?

Younger Dryas (YD) was a cold event that occurred between 12,800 and 11,600 calendar years ago. YD was characterized by a relatively sudden drop in temperature during the period.
The Younger Dryas named after Dryas octopetala, a small white and yellow wildflower of the rose family that flourished during the cold snap.

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