Biostratigraphic zonation for Cretaceous planktonic foraminifers examined in thin section

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Abstract
A biostratigraphic zonation for Cretaceous planktonic foraminifers examined in thin section provides improved resolution for dating oceanic pelagic limestones as well as calcareous concretions in continental margin deposits. The zonation comprises 31 zones and 4 subzones that span the Hauterivian to Maestrichtian stages. Recognition of the zones, which are modified from previous zones based on isolated specimens, results in a mean stratigraphic resolution of 2.1 m.y. In specific intervals, the resolution approaches 0.5 m.y. Use of the zonation has allowed dating and detailed correlation of allochthonous pelagic limestone in several circum-Pacific tectonostratigraphic terranes. In addition, the zonation provides a framework for correlating oceanic and continental-margin deposits as well as low- and middle-latitude assemblages of Cretaceous planktonic foraminifers.

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