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The Punta del Cobre formation consists of a volcanic and sedimentary sequence that dates from the Late Jurassic to the Early Cretaceous. It crops out in the Copiapó river valley and includes clastic sedimentary levels among andesitic lavas. It is interpreted that the rocks were deposited in a clastic platform or coastline contemporary with submarine volcanic activity, including lava and explosive eruptions. Fossils found in the formation indicate a Valanginian age.

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