Pliocene-Pleistocene Boundary, Northern Gulf of Mexico

Abstract

Changes in planktonic microfossil assemblages in Atlantic and Pacific sediment cores of Late Cenozoic age correspond in a general way with a horizon recognized in neritic sediments of the northern Gulf of Mexico. Geological evidence from the Gulf Coast indicates that the changes occurred near theend of the Aftonian interglaciation of the early Pleistocene rather than atthe end of the Pliocene, as proposed by other investilgators.