A well-exposed sequence of the Caleta Herradura de Mejillones section on the Pacific coast of northern Chile includes horizons of planktonic foraminiferal Zones N7 to N17 of Early to Late Miocene age. Successive appearances of species of the Praeorbulina-Orbulina lineage occur in the rich planktonic foraminiferal assemblage. An abrupt assemblage change in the basal part of Middle Miocene Zone N10 is marked by abundant Globigerinita glutinata, which continues through most of Zone N10, and suggests upwelling conditions in the surrounding seas during this time.

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