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  2. Cerro Azul Formation - Wikipedia

    en.wikipedia.org/wiki/Cerro_Azul_Formation

    The Cerro Azul Formation (Spanish: Formación Cerro Azul), also described as Epecuén Formation, is a geological formation of Late Miocene (Tortonian, or Huayquerian in the SALMA classification) age in the Colorado Basin of the Buenos Aires and La Pampa Provinces in northeastern Argentina.