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In page Collón Curá Formation:
"The oldest age for the formation has been given as 16.1 Ma,[11] and the top of the formation has been dated to 11 ± 1, and more precisely to 10.7 Ma.[1] 40Ar/39Ar analysis on amphibole crystals, collected from fresh pumice clasts, revealed an age of 14.86 ± 0.13 Ma for the middle section of the Collón Curá Formation in the Gastre Sub-basin of the Cañadón Asfalto Basin.[12] Earlier estimates based on K/Ar dating on biotite minerals of the Pilcaniyeú Ignimbrite Member were given as 15 Ma (1980) and 14.1 Ma (1990). Overall, the age of the formation ranges from Langhian to earliest Tortonian.[13]
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