“The Pleistocene period ended in death. This was no ordinary extinction of a vague geological period which fizzled to an uncertain end. This death was catastrophic and all-inclusive... The large animals that had given the name to the period became extinct. Their death marked the end of the era. But how did they die? What caused the extinction of forty million animals?” DeathNatureAnimalsCatastropheExtinctionYounger DryasPleistoceneGeological Period Book:The Lost Americans, The Story of the Man They Said Never Was: Old Stone-Age American Source: The Lost Americans, The Story of the Man They Said Never Was: Old Stone-Age American