The Oligocene-Miocene Boundary on both sides of the Atlantic

Abstract

Abstract The sequence of Miogypsina species in the type region of the Aquitanian-Burdigalian offers a good basis for correlation. Early Aquitanian corresponds to the range of M. gunteri , early Burdigalian to those of M. irregularis and M. burdigalensis , early Vindobonian to that of M. cushmani . In the western Mediterranean area application of this sequence is considered justifiable. Comparison with the similar sequence in America shows a much older occurrence of equivalent species in the western hemisphere than in Europe. A correction of the American time scale is considered premature when made on the Miogypsinidae alone.