Madden, R. H., Guerrero, J., Kay, R. F., Flynn, J. J., Swisher/III, C. C., & Walton, A. H. (1994). The Laventan Stage and Laventan Age; New Chronostratigraphic and geochronologic units for the Miocene of South America (Vol. April 3-8, 1994). Presented at the VI Congreso Argentino de Paleontologia y Bioestratigrafia, Trelew, Chubut, Argentina.

Madden, R. H., J. Guerrero, R. F. Kay, J. J. Flynn, C. C. Swisher/III, and A. H. Walton. “The Laventan Stage and Laventan Age; New Chronostratigraphic and geochronologic units for the Miocene of South America,” Vol. April 3-8, 1994. Trelew, Chubut, Argentina, 1994.

Madden RH, Guerrero J, Kay RF, Flynn JJ, Swisher/III CC, Walton AH. The Laventan Stage and Laventan Age; New Chronostratigraphic and geochronologic units for the Miocene of South America. In Trelew, Chubut, Argentina; 1994.

Madden, R. H., et al. The Laventan Stage and Laventan Age; New Chronostratigraphic and geochronologic units for the Miocene of South America. Vol. April 3-8, 1994, 1994.

Madden RH, Guerrero J, Kay RF, Flynn JJ, Swisher/III CC, Walton AH. The Laventan Stage and Laventan Age; New Chronostratigraphic and geochronologic units for the Miocene of South America. Trelew, Chubut, Argentina; 1994.