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El Holoceno medio palustre de la llanura litoral del Baix Ter (Girona)

Authors: Roqué i Pau, Carles; Pallí Buxó, Lluís; Díaz del Olmo, Fernando;

El Holoceno medio palustre de la llanura litoral del Baix Ter (Girona)

Abstract

The paludal deposits presented here belong to a geomorphological unit identified between Palafrugell Corridor and the littoral plains of Ter River (Baix Ter), associated to a carbonate-rich spring system. The sections show a distintic clay level, mixed with black silts, very rich in snail remains. The malacological assemblage contained stillwaters species (Bithynia leachii, Galba truncatula, Pisidium milium, Radix peregra) along with damp species (Monacha cartusiana, Oxyloma elegans, Succinea putris, Succinella oblonga, Vallonia pulchella, Vertigo sp.). Some open-dry species are also present (Cernuella virgata, Eobania vermiculata, Pomatias elegans, Rumina decollata) revailing a mosaic-like landscape. Radiocarbon dates place this level ca. 7.000BPwithin the Holocene sequence of the Baix Ter basin. Colluvial deposits on top of these paludal levels have a typical open-dry malacological assemblage (Cernuella virgata, Cochlicella acuta, Eobania vermiculata, Pomatias elegans, Rumina decollata, Trochoidea ele - gans) the same assemblage that inhabits the Empordà littoral plains nowadays.

Se analiza un conjunto de materiales palustres situados en la zona de contacto entre el corredor de Palafrugell y la llanura litoral del río Ter (Baix Ter), relacionados con un sistema de derrame de aguas surgentes ricas en carbonato cálcico. Las secuencias estudiadas se caracterizan por la presencia de un nivel de lutitas negruzcas con abundante malacofauna. El registro malacológico incluye especies propias de medios acuáticos de aguas tranquilas y de ambientes terrestres húmedos. Aparecen también algunas especies terrestres características de medios abiertos y secos que denotan las condiciones ambientales de las áreas circundantes a las zonas pantanosas. Las dataciones 14C fechan estos materiales en ca. 7.000 a. BP, por lo que se inscriben dentro de la fase holocena de relleno de la depresión del Baix Ter. Los coluviones que recubren los sedimentos palustres presentan una malacofauna terrestre, típica de ambientes abiertos y secos, idéntica a la que coloniza hoy en día la llanura del Empordà.

Country
Spain
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Keywords

Empordà, NE España, paleoambiente, Paleoambiente, Río Ter, sedimentos palustres, Palaeoenvironments, Holoceno medio, Mid Holocene, Artículos de Investigación, Ter River, NE Spain, Sedimentos palustres, Paludal deposits, río Ter

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
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.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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