The ammonites and age of the San Cayetano Formation from the Sierra del Rosario, western Cuba

Abstract

The first ammonites recorded from the San Cayetano Formation of the Sierra del Rosario (western Cuba) are assigned to the genus Perisphinctes, indicating that the upper part of the formation is of Oxfordian age. In the investigated assemblage, established is a new ammonite species Perisphinctes (?Dichotomosphinctes) cayetanensis Myczyński, sp. n. A comparison with the ammonite-bearing; Francisco Formation shows that the upper most part of the San Cayetano Formation is of Middle Oxfordian age.