|mhorn||Дата: Friday, 12.12.2014, 16:15 | Сообщение # 1|
|López Martínez R., Barragán R., Buitrón Sánchez B.E., Rojas R. (2014) Sea level changes through the Jurassic/Cretaceous boundary in western Cuba indicated by taphonomic analysis // Boletín de la Sociedad Geológica Mexicana, Vol. 66, núm. 3, P.431-440 |
The taphonomical and microfacies analyses of the Guasasa Formation in the San Vicente section of western Cuba, allowed the recognition of regional sea level fluctuations through the Jurassic/Cretaceous transition. Four discrete taphofacies associated with different depositional conditions were characterized through the section. The paleoecological conditions reconstruction indicates that the site of deposition changed from a shallow water carbonate bank recognizable at the base of the section (late Tithonian facies of the San Vicente Member) into a deep-water basinal environment at its top through the Berriasian, as facies of the overlying El Americano member. This continuous deepening of the basin was interrupted only by a short-term sea level drop close to the Jurassic/Cretaceous boundary.
Middle Jurassic - Lower Cretaceous ammonites & aptychi