 Similarly, an analysis of a stalagmite growing from a cave in Puerto Princesa Subterranean River National Park, Palawan, the Philippines, found that the onset of the Younger Dryas was also delayed there.Proxy data recorded in the stalagmite indicate that more than 550 calendar years were needed for Younger Dryas drought conditions to reach their full extent in the region and about 450 calendar years to return to pre-Younger Dryas levels after it ended.In Western Europe and Greenland, the Younger Dryas is a well-defined synchronous cool period.