The Miocene/Oligocene Boundary and the Use of the Term Aquitanian

Abstract

Abstract It is considered that some fossils, e.g. Orbulina and Miogypsina , are good indicators that beds containing them are of post-Oligocene age, and that the ages of some beds in certain parts of the world require reconsideration; mention is made of successions in Morocco, Venezuela, and Peru. It is recommended that the use of the term “Aquitanian” be restricted to beds of basal Miocene age.