 The authors of a subsequent paper that described three approaches to population dynamics in the Younger Dryas in North America concluded that there had been a significant decline and/or reorganisation in human population early in this period.The same paper also shows an apparent resurgence in population and/or settlements in the later Younger Dryas.There is also no evidence of continent-wide wildfires at any time during terminal Pleistocene deglaciation, though there is evidence that most larger wildfires had a human origin, which calls into question the origin of the "black mat."