
It means that the fossil record supports a violently turbulent flood sedimentation chronology, with high speed long range transport of sand, gravel and boulders, causing the sudden death and burial of billions of creatures, with VERY uneven deaths occurring up and down the rock column -- -- not a gradualistic, millions of years, slower-than-molasses process.
And a curiously selective sudden death and burial, killing all of certain species rendering them extinct, while leaving no evidence of having killed any members of other species.