Benthic foraminiferal assemblages from the Cretaceous/Tertiary boundary (KTB) of eight complete or near complete, land-based sections from different depositional environments, record sudden and marked changes of trophic structures and abundance which are bathymetrically related Deep-water assemblages were less severely affected by the KTB event (KTBE) probably in consequence of increased organic matter flux to the sea floor in response to oxygen deficiency in deep- and intermediate-waters which counterbalanced the drop of oceanic primary productivity. At the KTB the sea floor ecosystem experienced a differentiation into two separate domains: a shallow-water "epifaunal domain" and a deep-water "infaunal domain"

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