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Abstract:

Foraminiferal fossil assemblages of the shelly concentration, which represents the type section of Cerro de la Gloria Member of Las Escobas Formation, were analyzed for the first time. Taxonomic, quantitative and taphonomical analyses were made in order to obtain paleoenvironmental (physical as well biological) information. The complexity of the internal structure of the taphocoenoses was analyzed to infer the history of the final concentration process. The shell bed of Channel 15 corresponds to a shoreface longshore bar deposited in a brackish, unstable, wave-dominate coast. Shoreface and beach (foreshore) regressive facies were recognized. Taphonomic processes have modified the paleobiocoenoses by the selective preservation of autochthonous elements and by the addition of parautochthonous fauna from relict beachs and lagoons. Thus, the taphocoenoses is a within-habitat time-averaged assemblage composed of species that inhabit shallow shelf marine environments. Discrimination of autochthonous and parautochthonous fauna was possible based on taphonomic signatures of tests. The addition of the parautochthonous elements was related with longshore currents and littoral drift, and with high-energy events, probably with storm-waves, when erosion of the Pre-Mid Holocene substrate was more intense. Thus, the contribution of parautochthonous fauna is directly related with lithology and therefore, with dynamic of the paleoenvironment: in the shoreface, autochthonous fauna dominates in clastic sands with lamination and parallel stratification, whereas parautochthonous elements dominate in shoreface shelly gravels and in the foreshore sands. In the upper part of the section (beach facies), mainly parautochthonous elements related with erosion of the Pre-Mid Holocene substrate was recognized, since the shoreface was only periodically affected by marine processes, i.e., during storms. © 2003 Éditions scientifiques et médicales Elsevier SAS. All rights reserved.

Registro:

Documento: Artículo
Título:Benthic foraminifers and paleoecology of a Holocene shelly concentration, Salado Basin, Argentina
Autor:Laprida, C.; Bertels-Psotka, A.
Filiación:CONICET - Depto. de Cie. Geol., Facultad de Cie. Exactas y Naturales, Univ. de Buenos Aires. Ciudad Univ., Pabellón 2, Ciudad de Buenos Aires 1428, Argentina
Palabras clave:Forminifers; Holocene; Shallow marine paleoenvironment; Shelly concentration; Taphonomy; beach; benthic foraminifera; Holocene; paleoecology; paleoenvironment; shoreline; taphonomy; taxonomy; Argentina; Salado Basin; Foraminifera
Año:2003
Volumen:36
Número:5
Página de inicio:559
Página de fin:572
DOI: http://dx.doi.org/10.1016/S0016-6995(03)00061-5
Título revista:Geobios
Título revista abreviado:Geobios
ISSN:00166995
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166995_v36_n5_p559_Laprida

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Citas:

---------- APA ----------
Laprida, C. & Bertels-Psotka, A. (2003) . Benthic foraminifers and paleoecology of a Holocene shelly concentration, Salado Basin, Argentina . Geobios, 36(5), 559-572.
http://dx.doi.org/10.1016/S0016-6995(03)00061-5
---------- CHICAGO ----------
Laprida, C., Bertels-Psotka, A. "Benthic foraminifers and paleoecology of a Holocene shelly concentration, Salado Basin, Argentina " . Geobios 36, no. 5 (2003) : 559-572.
http://dx.doi.org/10.1016/S0016-6995(03)00061-5
---------- MLA ----------
Laprida, C., Bertels-Psotka, A. "Benthic foraminifers and paleoecology of a Holocene shelly concentration, Salado Basin, Argentina " . Geobios, vol. 36, no. 5, 2003, pp. 559-572.
http://dx.doi.org/10.1016/S0016-6995(03)00061-5
---------- VANCOUVER ----------
Laprida, C., Bertels-Psotka, A. Benthic foraminifers and paleoecology of a Holocene shelly concentration, Salado Basin, Argentina . Geobios. 2003;36(5):559-572.
http://dx.doi.org/10.1016/S0016-6995(03)00061-5