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Se describen doce taxa de condrictios fosiles provenientes de rocas asignadas al Plioceno Superior de la Formacion Horcon, region de Valparaiso, Chile central; se discuten sus registros previos, implicancias paleobiogeografi cas y paleoambientales. La fauna comprende Callorhinchus sp., Heterodontus sp., Carcharodon carcharias, Isurus oxyrinchus, Galeorhinus galeus, Carcharhinus brachyurus, Hexanchus griseus, Squatina sp., Pristiophorus sp., Rajidae, Dasyatidae y Myliobatidae. Esta es una de las asociaciones de condrictios mas diversas del Neogeno Tardio de Chile y del resto de America del Sur.

Condrictios fósiles del Plioceno Superior de la Formación Horcón, Región de Valparaíso, Chile central