Jurassic formations of middle Bajocian and Callovian-upper Oxfordian age in the Chilean coastal range between Arica and the area south of Iquique are folded along generally north-trending lines, whereas the unconformably overlying Atajana and younger Cretaceous beds exhibit westerly structural trends. Evidence is thus provided for the occurrence of Nevadian folding in this part of South America. The Jurassic rocks are intruded by diorite of the Andean batholith whose emplacement was post-tectonic and can be dated locally as post-Oxfordian but pre-Atajana, since well-rounded pebbles of the Andean diorite occur in the basal conglomerate of the Atajana formation.

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