Hay, W. W.; Mohler, H. P.; Roth, P. H.; Schmidt, R. R.; Boudreaux, J. E. (1967). Calcareous nannoplankton zonation of the Cenozoic of the Gulf Coast and Caribbean-Antillean area, and transoceanic correlation. Transactions of the Gulf-Coast Association of Geological Societies. 17: 428-480.
453930
Hay, W. W.; Mohler, H. P.; Roth, P. H.; Schmidt, R. R.; Boudreaux, J. E.
1967
Calcareous nannoplankton zonation of the Cenozoic of the Gulf Coast and Caribbean-Antillean area, and transoceanic correlation
Transactions of the Gulf-Coast Association of Geological Societies