The study of continental and marine benthic communities of the Cretaceous/Tertiary transitional zone in the Pyrenees has shown, besides various extinctions (clavatoraceae, larger foraminifera), a severe impoverishment of faunas and floras. These changes are analyzed among various benthic fossil groups of continental and shallow marine environments; then they are compared with changes in benthic deep sea ostracods associated with mass extinction in planktonic assemblages, at the Cretaceous/Tertiary boundary, in order to have a better understanding of the ecological processes which have driven them.

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