Publication: Interpretación paleoambiental del yacimiento
de La Gloria 4 (Plioceno, Fosa de Teruel)
a partir del análisis de facies y de asociaciones
de gasterópodos y de mamíferos
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Publication Date
1997
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Universidad Complutense de Madrid. Departamento de Estratigrafía
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Abstract
El yacimiento de La Gloria 4, situado al E de la ciudad de Teruel, contiene una importante fauna de vertebrados de edad Plioceno inferior (Alfambriense inferior, zona MN14). El yacimiento se sitúa a techo de una sucesión de depósitos correspondientes al Turoliense (Mioceno superior) que consisten en un conjunto inferior terrígeno, formado por facies distales de abanico aluvial, y un conjunto superior constituido por depósitos propios de sistemas lacustres carbonatados someros. La sucesión culmina con depósitos carbonatados y margosos, ya dc edad Plioceno, que constituyen la sección donde se encuentra cl yacimiento de La Gloria 4. Esta sección ha sido estudiada en detalle, integrando las observaciones de facies a meso- y microescala, sus relaciones geométricas, las asociaciones de gasterópodos recogidas en distintos niveles, y la información suministrada por los restos de vertebrados en el yacimiento. Dicha integración de datos permite interpretar de forma detallada las condiciones paleoambientales de formación del yacimiento, el cual es el resultado de la concentración de restos de vertebrados en charcas pantanosas desarrolladas en periodos de muy escasa lámina de agua dentro de la evolución del sistema lacustre. En este contexto, las evidencias tafonómicas extraídas de los restos faunísticos sugieren un carácter autóctono del yacimiento. Se subraya, por último, la importancia de los periodos de desecación/exposición subaérea en el sistema lacustre como condicionante del estilo de concentración de los vertebrados en este punto de la Fosa de Teruel.
The mammal site of La Gloria 4 is located to the west of the town of Teruel and hosts an outstanding vertebrate fauna of Lower Pliocene age (Lower Alfambrian, NM 14 zone. The vertebrates occur at the uppermost part of a Turolian (Upper Miocene)/Pliocene succession formed of a lower terrigenous unit that comprises distal alluvial fan deposits, aud an upper stratigraphic unit made up by lacustrine carbonate and marí sediments. La Gloria 4 occurs within these shallow lake deposits. A cutbank open at the site of the vertebrate concentration allowed a detailed study of the section by integrating meso- and micro-seale facies observations, geometrie relationships betweeen the dcposits, insight from the gastropod faunes, and palaeoecological and taphonomic data inferred from the vertebrates. This integrated approach contributes a detailed interpretation of the environmental conditions in which the vertebrate remalns were concentrated. The locality is interpreted as a rcsult of the concentration of mammal remajos in marshy ponds which formed at low lakestands. In this setting, taphonomic evidence extracted from the mammal bones suggest their concentration was autochtonous. The importance of desiccation/subaerial exposure events throughout the evolution of the lake system is outlined as a relevant palacoenvironmental condition that explains inany of the observed features of the mammal site.
The mammal site of La Gloria 4 is located to the west of the town of Teruel and hosts an outstanding vertebrate fauna of Lower Pliocene age (Lower Alfambrian, NM 14 zone. The vertebrates occur at the uppermost part of a Turolian (Upper Miocene)/Pliocene succession formed of a lower terrigenous unit that comprises distal alluvial fan deposits, aud an upper stratigraphic unit made up by lacustrine carbonate and marí sediments. La Gloria 4 occurs within these shallow lake deposits. A cutbank open at the site of the vertebrate concentration allowed a detailed study of the section by integrating meso- and micro-seale facies observations, geometrie relationships betweeen the dcposits, insight from the gastropod faunes, and palaeoecological and taphonomic data inferred from the vertebrates. This integrated approach contributes a detailed interpretation of the environmental conditions in which the vertebrate remalns were concentrated. The locality is interpreted as a rcsult of the concentration of mammal remajos in marshy ponds which formed at low lakestands. In this setting, taphonomic evidence extracted from the mammal bones suggest their concentration was autochtonous. The importance of desiccation/subaerial exposure events throughout the evolution of the lake system is outlined as a relevant palacoenvironmental condition that explains inany of the observed features of the mammal site.