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This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-05-17 and was most recently seen on 2026-05-17.
The Arqueros Formation is a volcanic, volcaniclastic, sedimentary, and fossiliferous geological formation that outcrops near in northwestern Coquimbo Region, northern Chile. It is dated back to the Hauterivian-Barremian stages of the Early Cretaceous. The lithology of the unit is composed of alternations of andesites and volcaniclastic rock layers and fossiliferous limestone of marine origin. The exposed parts of the formation run as a belt from north to south through the central part of the region. There are large outcrops of the formation in mountain plateaux north of Quebrada Marquesa, a tributary of Elqui River. These outcrops are thought to have originated by uplift of the region bounded by one normal fault to the west and one to the east.
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