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Re: Dino Demise by Angiosperms

>>(in North America at least) the gymnosperms increase sharply at
the K/T-boundary (first the fern spike and then conifers replace
angiosperms as dominant trees). <<
What was the cause of the spike?  Reaction to a cooler world climate?  Is the
ratio of angiosperms to gymnosperms still at the level it was just after the K/T
extinction, or has the spike in gynosperms gone back down?