Zacarías, I.A.; Monferran, M.D.; Martínez, S.; Gallego, O.F.; Cabaleri, N.G.; Armella, C.; Silva Nieto, D. "Taphonomic analysis of an autochthonous fossil concentration in Jurassic lacustrine deposits of Patagonia, Argentina" (2019) Palaeogeography, Palaeoclimatology, Palaeoecology. 514:265-281
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A new fossiliferous level from the Las Chacritas Member (Bajocian-Callovian) of the Cañadón Asfalto Formation, which crops out in the Cañadón Asfalto Basin (Extraandean-Chubut) Argentina was analyzed. The study of this assemblage was made on the basis of paleoecological, sedimentological and taphonomic criteria. This polytypic assemblage is composed mainly of bivalves, spinicaudatans, gastropods, and ostracods, associated with plant remains (such as Brachyphyllum sp., Charophytes, conifers, seeds, and indeterminate remains). The tabular bed of oncolitic packstone facies corresponds to a shallow marginal lacustrine environment of intense organic productivity. Taphonomic and paleoecological features, such as closed articulated valves, random orientation, and size-frequency histograms indicate that the fauna is autochthonous. The short life cycle with a quick turnover of the population, suggests that the time averaging would only comprise a few years. In addition, the analysis of Energy dispersive X-ray spectrometry supports early diagenesis affecting the remains and favoring the dissolution of aragonite/calcite, as well as the silicification of shells. Therefore, this fossil assemblage can be classified as a sedimentological concentration, which could have been originated by seasonal cyclicity in an environment subject to water level fluctuations. © 2018 Elsevier B.V.


Documento: Artículo
Título:Taphonomic analysis of an autochthonous fossil concentration in Jurassic lacustrine deposits of Patagonia, Argentina
Autor:Zacarías, I.A.; Monferran, M.D.; Martínez, S.; Gallego, O.F.; Cabaleri, N.G.; Armella, C.; Silva Nieto, D.
Filiación:Centro de Ecología Aplicada del Litoral, Universidad Nacional del Nordeste, CONICET, CECOAL, C.C. 128, Ruta 5, Km 2,5, Corrientes, 3400, Argentina
Facultad de Ciencias, Universidad de la República, Iguá 4225, Montevideo, 11400, Uruguay
Instituto de Geocronología y Geología Isotópica (INGEIS-CONICET-UBA), Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina
Servicio Geológico Minero Argentino, Instituto de Geología y Recursos Minerales, Av. Julio A. Roca 651, 10_ Piso, Buenos Aires, C1067ABB, Argentina
Palabras clave:Argentina; Cañadón Asfalto Formation; Fossil concentration; Marginal lacustrine facies; Middle Jurassic; Taphonomy; autochthony; bivalve; diagenesis; facies; fossil assemblage; fossil record; gastropod; Jurassic; lacustrine deposit; ostracod; paleoecology; seasonal variation; silicification; skeletal remains; taphonomy; Argentina; Patagonia; Bivalvia; Brachyphyllum; Characeae; Coniferophyta; Gastropoda; Ostracoda
Página de inicio:265
Página de fin:281
Título revista:Palaeogeography, Palaeoclimatology, Palaeoecology
Título revista abreviado:Palaeogeogr. Palaeoclimatol. Palaeoecol.


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---------- APA ----------
Zacarías, I.A., Monferran, M.D., Martínez, S., Gallego, O.F., Cabaleri, N.G., Armella, C. & Silva Nieto, D. (2019) . Taphonomic analysis of an autochthonous fossil concentration in Jurassic lacustrine deposits of Patagonia, Argentina. Palaeogeography, Palaeoclimatology, Palaeoecology, 514, 265-281.
---------- CHICAGO ----------
Zacarías, I.A., Monferran, M.D., Martínez, S., Gallego, O.F., Cabaleri, N.G., Armella, C., et al. "Taphonomic analysis of an autochthonous fossil concentration in Jurassic lacustrine deposits of Patagonia, Argentina" . Palaeogeography, Palaeoclimatology, Palaeoecology 514 (2019) : 265-281.
---------- MLA ----------
Zacarías, I.A., Monferran, M.D., Martínez, S., Gallego, O.F., Cabaleri, N.G., Armella, C., et al. "Taphonomic analysis of an autochthonous fossil concentration in Jurassic lacustrine deposits of Patagonia, Argentina" . Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 514, 2019, pp. 265-281.
---------- VANCOUVER ----------
Zacarías, I.A., Monferran, M.D., Martínez, S., Gallego, O.F., Cabaleri, N.G., Armella, C., et al. Taphonomic analysis of an autochthonous fossil concentration in Jurassic lacustrine deposits of Patagonia, Argentina. Palaeogeogr. Palaeoclimatol. Palaeoecol. 2019;514:265-281.