Citation: W. Hay W et E. Boudreaux J, Committee on Mediterranean Neogene Stratigraphy. Proceedings of the 4th Session. Calcareous Nannofossils in the Submarex core, Nicaragua Rise, Caribbean Sea; le Castella, Calabria; and the age of the Pliocene-Pleistocene boundary, Giornale di geologia , 35(02), 1968, pp. 143-152