News Finding: Evolutionary 'Big Bang' in Cambrian. 
Paper Finding: Darwin suggested that the sudden appearance of a range of advanced animals in the Cambrian was difficult to reconcile with gradual evolution by natural selection , as they would have required a lengthy period of Precambrian evolution.
News Context: Evolutionary 'Big Bang' in Cambrian. 
Paper Context: A relatively short Precambrian prelude dictates this pattern, while even a lengthy ''phylogenetic fuse'' can be interpreted to be consistent with it: phyla could have diverged deep in the Precambrian but still acquired many novelties simultaneously across the early Cambrian (though it is hard to interpret innovations shared by multiple phyla as evolving in the Cambrian under the second scenario). Darwin suggested that the sudden appearance of a range of advanced animals in the Cambrian was difficult to reconcile with gradual evolution by natural selection , as they would have required a lengthy period of Precambrian evolution. A much shorter cryptic period would be required if rates of evolution in the late Precambrian and early Cambrian could be demonstrated to be substantially elevated.