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The Paja Formation is a Mesozoic geologic formation from the Hauterivian - Aptian stages of the Early Cretaceous of central Colombia, extending in the Eastern Cordillera of the Colombian Andes in the departments of Cundinamarca, Santander and Boyaca. It mainly composed of mudrocks with nodules of sandstones and limestones, that are interpreted as part of a marginal marine deposit,〔Forero, H. & Sarmiento, L. 1985. La facies evaporítica de la Formación Paja en la región de Villa de Leiva. In Etayo-Serna, F. & Montaño, F. L. (eds.): ''Proyecto Cretácico. – Publicaciones geológicas especiales del INGEOMINAS'' 16 (17): 1–16.〕 with anoxic zones, in the warm and shallow sea that covered most of the Colombian territory during the Cretaceous.〔Gaona-Narvaez, T., Florentin, J. M. M., & Etayo-Serna, F. (2013). Geochemistry, palaeoenvironments and timing of Aptian organic-rich beds of the Paja Formation (Curití, Eastern Cordillera, Colombia). ''Geological Society, London, Special Publications'', 382(1), 31-48.〕 Plesiosaur, ichthyosaur, sea turtles, teleostean fishes and ammonites〔Patarroyo, P. (2010). Amonitas de un nivel de alta energía del Barremiano inferior en la Formación Paja de los sectores de Villa de Leyva (Boyacá) y de Vélez (Santander). ''Boletín de Geología'', 31(2).〕 remains are among the main fossils that have been recovered from its strata, mainly near to the modern town of Villa de Leiva in Boyaca.〔 ==Paleofauna== Ammonites Pulchellia Gerhardtia Toxancycloceras Karsteniceras Prodesheyesites 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Paja Formation」の詳細全文を読む スポンサード リンク
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