Abstract
The ammonite Olcostephanus and other fossils indicative of early Cretaceous age have been identified in the Patagua limestones, heretofore included as a member of the Jurassic Melon formation, in the Melon and La Ligua quadrangles. The new data lead to definition of the limestone series as a formation of Cretaceous age, and indicate that the Jurassic-Cretaceous boundary in central Chile should be redefined.
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