SOBRE LA PRESENCIA DE ZYGOGRAPTUS SP. (GRAPTOLITHINA) EN LA FORMACION DE GUALCAMAYO, ORDOVICICO DE SAN JUAN - LA RIOJA. AMGH [Internet]. 2013 Aug. 25 [cited 2025 Dec. 25];10(2):191-5. Available from: https://ameghiniana.org.ar/index.php/ameghiniana/article/view/1411