Soler, Miguel M., and Beatriz Coira. 2002. “Upper Oligocene - Lower Miocene Volcanism in the Mountain Range of Pirurayo, Northern Puna: Stratigraphy and Eruptive Mechanisms”. Revista De La Asociación Geológica Argentina 57 (2):160-72. https://revista.geologica.org.ar/raga/article/view/726.