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The Late Jurassic Lagunillas Formation exposed between 27°30ʹ and 28°30ʹS in the northern Chilean Andes comprises two members: a lower sedimentary member, and an upper volcanic member. This unit was deposited during a significant palaeogeographic change related to a major relative sea-level fall that took place in the Andean back-arc basin between 18° and 44°S. The sedimentary member of the Lagunillas...