George Bristol, lecture and book signing, Glacier National Park: A Culmination of Giants. Bristol takes readers on a journey through the history of Glacier National Park, beginning over a billion years ago from the formation of the Belt Sea, to the present day climate-changing extinction of the very glaciers that sculpted most of the wonders of its landscapes. He delves into the ways in which this area of Montana seemed to have been preparing itself for the coming of humankind through a series of landmass adjustments like the Lewis Overthrust and the ice ages that came and went.