Abstract
A biostratigraphic outline about the Callovian of Ricla (Zaragoza) is introduced upon a sample of 567 ammonoids along a profil of 70 m. The Lower Callovian (Bullatus and Rehmanni subzones and Voultensis/Michalskii and Patina subzones), Middle Callovian (Jason and Coronatum zones) and Upper Callovian (Athleta and Lamberti? zones) are identified. Quantitative interpretation is added.
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