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Nuevo yacimiento de trilobites en la Formación Agüeira (Ordovícico Superior) del sinclinorio de Vega de Espinareda (Zona Asturoccidental-leonesa, NO de España): su interés estratigráfico

A new trilobite locality from the Agüeira Formation (Upper Ordovician) of the Vega de Espinareda synclinorium (West Asturian-Leonese Zone, NW Spain) and its stratigraphical interest
Authors: Romero Gómez, Sara; Pereira, Sofía; López Medrano, Francisco; Arias Ferrero, Francisco; Rábano, Isabel; Colmenar Lallena, Jorge; Gutiérrez Marco, Juan Carlos;

Nuevo yacimiento de trilobites en la Formación Agüeira (Ordovícico Superior) del sinclinorio de Vega de Espinareda (Zona Asturoccidental-leonesa, NO de España): su interés estratigráfico

Abstract

Se presenta una nueva localidad paleontológica del Ordovícico del noroeste de España, ubicada en el flanco meridional del sinclinorio de Vega de Espinareda, al norte de Ponferrada (provincia de León). Se trata de la octava localidad con fósiles esqueléticos encontrada en la Formación Agüeira (Ordovícico Superior) del Dominio del Navia-Alto Sil de la Zona Asturoccidental-leonesa, y la primera ubicada en la mitad inferior de la formación. El nuevo yacimiento se sitúa muy próximo a su sección de referencia de la garganta fluvial entre las localidades de Congosto y Santa Marina del Sil, donde estos niveles eran interpretados como facies distales de un abanico submarino, en una sedimentación predominantemente turbidítica. Pero los trilobites, moluscos y braquiópodos encontrados, que por su escasa a nula desarticulación no parecen transportados, revelan una asociación propia de ambientes de plataforma mucho más someros, con fondos oxigenados como revela la alta concentración de galerías horizontales. La presencia de los trilobites Colpocoryphe grandis (Šnajdr) y Dalmanitina n. sp. (D. rabanoae Pereira, n. n.) indica una edad Berouniense temprano (= Sandbiense temprano), lo que abre la posibilidad de que el límite Ordovícico Medio/Superior se sitúe en los 400-450 m basales de la Fm. Agüeira en el sector estudiado.

Country
Spain
Keywords

QE1-996.5, 2506.19 Estratigrafía, Macizo Ibérico, Bioestratigrafía, Iberian Massif, Ordovician, West Asturian-Leonese zone, Biostratigraphy, Agüeira Formation, Geology, Artículos, bioestratigrafía, Biostratigraphy., Formación Agüeira, 551.733.1(460), 2416.02 Paleontología de Los Invertebrados, Paleontología, zona Asturoccidental- leonesa, Zona Asturoccidental-leonesa, 565.393(460), Zona Asturoccidental- leonesa, Geología estratigráfica, West Asturian-Leonese Zone, biostratigraphy, Ordovícico

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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
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