 Effects of the Younger Dryas were of varying intensity throughout North America.In western North America, its effects were less intense than in Europe or northeast North America; however, evidence of a glacial re-advance indicates that Younger Dryas cooling occurred in the Pacific Northwest.Speleothems from the Oregon Caves National Monument and Preserve in southern Oregon's Klamath Mountains yield evidence of climatic cooling contemporaneous to the Younger Dryas.