“Early Eocene 40Ar 39Ar Age for the Pampa De Jones Plant, Frog, and Insect Biota (Huitrera Formation, Neuquén Province, Patagonia, Argentina)”. Ameghiniana, vol. 47, no. 2, July 2010, pp. 207-16, https://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/170.