A massive logjam on the Chassezac River in present-day southern France burst in 3990BC.The Chasseen Legends is a book series that follow one of the first families who transition from hunter-gatherers to farmers in southern France. The story follows the lives of five generations of a family from mountainous hunters to plains farmers.

Source: Lost Shadows (The Chasseen Legends #3) by David William Allman | Goodreads