Publication: Subdivisión litoestratigráfica de las series hemipelágicas de edad Coniaciense-Thanetiense en el Prebético oriental (SE de España)
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Publication Date
2005
Authors
Chacón, B.
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Sociedad Geológica de España
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Abstract
Se propone un nuevo patrón litoestratigráfico, formado por siete unidades con rango de formación, para las rocas sedimentarias del Cretácico Superior (Coniaciense superior-Maastrichtiense superior) y del Paleoceno del Prebético Oriental (SE de España). Dichas rocas son esencialmente
carbonatos hemipelágicos y, por su considerable homogeneidad litológica, habían sido hasta el momento englobadas en unidades de mayor entidad, de indudable utilidad en los trabajos geológicos regionales pero que resultan poco prácticas para análisis bioestratigráficos o estratigráfico secuenciales, así como para cartografías geológicas detalladas. El objetivo de la nueva propuesta radica por tanto en el establecimiento de una subdivisión litoestratigráfica racional y útil para ese tipo de trabajos, fácilmente utilizable en futuras cartografías y trabajos estratigráficos. La subdivisión incluye siete formaciones, de las cuales, cinco son de nueva creación y se definen formalmente —Fm Naveta (Coniaciense-Santoniense superior), Fm Aspe (Campaniense basal-Maastrichtiense inferior), Fm Alberquilla (Daniense inferior-Thanetiense superior), Fm Agost (Daniense basal-Thanetiense superior) y Fm Pinoso (Thanetiense terminal-Ilerdiense medio)— y las dos restantes son unidades previamente definidas — Fm Carche (Santoniense terminal-Maastrichtiense inferior) y Fm Raspay (Maastrichtiense superior)— cuya definición se extiende ahora a la región considerada.
A new lithostratigraphical framework consisting of seven formations is proposed for the Upper Cretaceous (Upper Coniacian-Upper Maastrichtian) to Palaeocene sedimentary rocks of the eastern Prebetic Zone (SE Spain). These rocks are mostly hemipelagic carbonates and, because their relative lithological homogeneity, they have been usually framed in large stratigraphic units, of indubitable value in broad regional geological works, but unpractical for sequence stratigraphic and biostratigraphic analyses as well as for detailed geologic mapping. The objective of the new proposal is thus to rationalise the nomenclature of this area, and to establish a workable, mappable lithostratigraphical subdivision. This subdivision includes five new formations —Naveta Fm (Upper Coniacian-Upper Santonian), Aspe Fm (lowermost Campanian-Lower Maastrichtian), Alberquilla Fm (Lower Danian-Upper Thanetian), Agost Fm (lowermost Danian-Upper Thanetian) and Pinoso Fm (uppermost Thanetian-middle Ilerdian)— which are formally defined in this paper, and extends the definition of other two previously defined units: Carche Fm (uppermost Santonian-Lower Maastrichtian) and Raspay Fm (Upper Maastrichtian).
A new lithostratigraphical framework consisting of seven formations is proposed for the Upper Cretaceous (Upper Coniacian-Upper Maastrichtian) to Palaeocene sedimentary rocks of the eastern Prebetic Zone (SE Spain). These rocks are mostly hemipelagic carbonates and, because their relative lithological homogeneity, they have been usually framed in large stratigraphic units, of indubitable value in broad regional geological works, but unpractical for sequence stratigraphic and biostratigraphic analyses as well as for detailed geologic mapping. The objective of the new proposal is thus to rationalise the nomenclature of this area, and to establish a workable, mappable lithostratigraphical subdivision. This subdivision includes five new formations —Naveta Fm (Upper Coniacian-Upper Santonian), Aspe Fm (lowermost Campanian-Lower Maastrichtian), Alberquilla Fm (Lower Danian-Upper Thanetian), Agost Fm (lowermost Danian-Upper Thanetian) and Pinoso Fm (uppermost Thanetian-middle Ilerdian)— which are formally defined in this paper, and extends the definition of other two previously defined units: Carche Fm (uppermost Santonian-Lower Maastrichtian) and Raspay Fm (Upper Maastrichtian).