Publication: Estratigrafía de la "Cuenca de los Cameros" (Cordillera Ibérica Noroccidental, N de España) durante el tránsito Jurásico-Cretácico
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1994
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Sociedad Geológica de España
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Abstract
Los materiales estudiados, que son producto de la sedimentación continental en la "Cuenca de los Cameros", presentan una compleja organización interna, debido a los bruscos cambios de facies en la horizontal y a la relativa persistencia de las mismas en la vertical, donde se alcanzan
los 3800 m de espesor. Se han reconocido cinco aloformaciones separadas por discordancias, las tres primeras constituyen el "Alogrupo de Tera", y las dos últimas el "Alogrupo de Oncala". Estas son: 1. "Aloformación de Ágreda", formada por dos lito somas separados, de los cuales el principal alcanza los 255 m de potencia. Su edad es titónica. 2. "Aloformación de Magaña", cuyo espesor
máximo llega a 695 m se extiende a la práctica totalidad de la Cuenca, que muestra una clara estructuración. 3. "Aloformación de sa Matute", sus espesores máximos superan los 640 m. En estos momentos la Cuenca no muestra una estructuración tan clara. 4. "Aloformación de Huérteles", restringida a un surco muy pronunciado en el que se superan los 1000 m de potencia. 5. "Alofo~mación de Valdeprado", la sedimentación se vuelve a extender a toda la Cuenca, y el espesor de los materiales supera los 1160 m: Estas unidades se pueden correlacionar con las propuestas para otras áreas de la Cuenca Ibérica. Además, gracias a esta correlación se. puede aventurar una eqad titónica para el "Agr. de Tera" y berriasiense para el "Agr. de Oncala".
This paper studies the 3800 m thick sequence of sedimentary rocks that comprises the Jurassic-Cretaceous boundary in the northeastern sector of the Iberian Ranges: Cameros continental Basin (North-Central Spain). The sedimentary sequence shows a complex organization marked by strong lateral facies changes, while these facies show a great vertical persistence. The Tera and Oncala allogroups, separated by an important unconformity, constitute the major sedimentary units in the area. In turn, each of this allogroups can be subdivided into three and two alloformations, nacmely: 1. "Agreda Alloformation", formed by two independent lithosomes. The main one is up to 255 m thick. The age of this unit is Tithonian. 2. "Magaña Alloformation", sedimentation extends to the whole Basin, which is c1early structured. The maximun thicknes of this unit is up to 695 m. 3. "Sierra Matute Alloformation", the Basin aparently is less structured, the thickness in excess of 640 m. 4. "Huérteles AI1oformation", sedimentation isrestricted to a marked through with deposits which may exceed 1000 m in thickness. 5. "Valdeprado Allofonnation", sedimentation extendsthe whole Basin again, this unit can be thicker than 1160 m. 'fhese alloformations and allogroups can be correlated with other units proposed in other areas of the Iberian Basin, and a Tithonian and Berriasian age can be proposed for the "Tera Agr." and the "Oncala Agr.", respectivelly.
This paper studies the 3800 m thick sequence of sedimentary rocks that comprises the Jurassic-Cretaceous boundary in the northeastern sector of the Iberian Ranges: Cameros continental Basin (North-Central Spain). The sedimentary sequence shows a complex organization marked by strong lateral facies changes, while these facies show a great vertical persistence. The Tera and Oncala allogroups, separated by an important unconformity, constitute the major sedimentary units in the area. In turn, each of this allogroups can be subdivided into three and two alloformations, nacmely: 1. "Agreda Alloformation", formed by two independent lithosomes. The main one is up to 255 m thick. The age of this unit is Tithonian. 2. "Magaña Alloformation", sedimentation extends to the whole Basin, which is c1early structured. The maximun thicknes of this unit is up to 695 m. 3. "Sierra Matute Alloformation", the Basin aparently is less structured, the thickness in excess of 640 m. 4. "Huérteles AI1oformation", sedimentation isrestricted to a marked through with deposits which may exceed 1000 m in thickness. 5. "Valdeprado Allofonnation", sedimentation extendsthe whole Basin again, this unit can be thicker than 1160 m. 'fhese alloformations and allogroups can be correlated with other units proposed in other areas of the Iberian Basin, and a Tithonian and Berriasian age can be proposed for the "Tera Agr." and the "Oncala Agr.", respectivelly.