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Theories on the extinction of plants

>>Yes,...poor choice of words. Most herbivores died off. Perhaps Condylarths
consumed roots and tubers?<<

This is not to punch holes in anybody's theories, I am generaly curious as to
WhAT HAPPENED TO THE PLANTS?  Philip Bigelow's list of the plants (it's at
Dinosauria Online)of Helly Creek  (right at the end of the K) show a striking
resemblence to plants in similar environments today.  Amoung the plants are
species of ficus, beech trees, tulip trees, sycamores, grapes (possibly),
walnut trees, sweet gum, ginko, cinnamon trees, poplars, redwoods, apple trees
(rosaceae), sequoia, cypress, elms, etc, etc, etc.  These are _large_ species,
at least shrub size, and did not burrow.  How did they pull through?