 In Great Britain, beetle fossil evidence suggests that the mean annual temperature dropped to , and periglacial conditions prevailed in lowland areas, and icefields and glaciers formed in upland areas.Nothing of the period's size, extent, or rapidity of abrupt climate change has been experienced since its end.In addition to the Younger, Older, and Oldest Dryases, a century-long period of colder climate, similar to the Younger Dryas in abruptness, has occurred within both the Bølling oscillation and the Allerød oscillation interstadials.