 Earlier, the hypothesis was dismissed based on the timing of the Laacher See Tephra relative to the clearest signs of climate change associated with the Younger Dryas Event within various Central European varved lake deposits.This set the scene for the development of the Younger Dryas Impact Hypothesis and the meltwater pulse hypothesis.However, more recent research places the very large eruption of the Laacher See volcano at 12,880 years BP, coinciding with the initiation of North Atlantic cooling into the Younger Dryas.