you got it
when earth was within Saturn`s plasma sphere earth was in the ultraviolet light sequence signal because of the plasma spheres filtering affect
we know our present sun became more and more visible to surface life over linear time as our Saturn system become immersed within our suns solar system so this would alter our ultraviolet biased environment towards what it has now become , hence transmutation of all surface life would occur in this transferal processes/era
until the final cascade/flood
when the tree of life broke, the plasma sphere collapsed and all surface life switched to sol light environment
the ensuing climatic chaos and altering light wave length made certain that ultraviolet biased surface life died out and transmuted sol light surface life flourished