Etayo Serna, F. (1979). Zonation of the Cretaceous of central Colombia by Ammonites. <em>Publicaciones Geológicas Especiales del Ingeominas.</em> 2: 1-188., available online athttp://jurassic.ru/pdf/Etayo-Serna_1979.pdf[details]
original descriptionEtayo Serna, F. (1979). Zonation of the Cretaceous of central Colombia by Ammonites. <em>Publicaciones Geológicas Especiales del Ingeominas.</em> 2: 1-188., available online athttp://jurassic.ru/pdf/Etayo-Serna_1979.pdf[details]
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