“Early Eocene 40Ar 39Ar Age for the Pampa De Jones Plant, Frog, and Insect Biota (Huitrera Formation, Neuquén Province, Patagonia, Argentina)”. Ameghiniana 47, no. 2 (July 9, 2010): 207–216. Accessed October 10, 2025. https://ameghiniana.org.ar/index.php/ameghiniana/article/view/170.