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  2. Cerro Azul Formation - Wikipedia

    en.wikipedia.org/wiki/Cerro_Azul_Formation

    Outcrop map of the 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 .