Abstract
Dredged carbonates from the margins of Rockall Trough mostly represent hard grounds made up of outer shelf benthonic skeletal assemblages and pelagic ooze. Chertification and occasional iron impregnation either as a crust or dominant association, are particular features of these rocks which have frequently suffered a complex history of cementation.
Further micropalaeontological work allows the dating to be refined and the Tertiary carbonates are shown to contain upper Eocene microfaunas that have been transported and rolled prior to final lithification, probably during the post-Eocene erosion interval widely reported in the Northeast Atlantic, Reflector R4.
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