Early Eocene 40Ar/39Ar age for the Pampa de Jones plant, frog, and insect biota (Huitrera Formation, Neuquén Province, Patagonia, Argentina). AMGH. 2010;47(2):207-216. Accessed January 2, 2026. https://ameghiniana.org.ar/index.php/ameghiniana/article/view/170