“ÓPALO ORGANÓGENO EN SEDIMENTOS SUPERFICIALES DE LA LLANURA SANTAFESINA”, AMGH, vol. 9, no. 3, pp. 265–279, Aug. 2013, Accessed: Sep. 19, 2025. [Online]. Available: https://www.ameghiniana.org.ar/index.php/ameghiniana/article/view/1390