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Featured researches published by Graciela Visconti.


Ameghiniana | 2014

MINERALOGY, GEOCHEMISTRY AND PALEOHISTOLOGY OF PLIOCENE MAMMALS FROM THE MONTE HERMOSO FORMATION (ARGENTINA). PAEDOTHERIUM BONAERENSE (NOTOUNGULATA, HEGETOTHERIIDAE) AS A CASE STUDY

Rodrigo L. Tomassini; Claudia I. Montalvo; Teresa Manera; Graciela Visconti

Abstract . We describe and analyze the mineralogical, geochemical and paleohistological characteristics present in hemimandibles of Paedotherium bonaerense (Ameghino) (Mammalia, Notoungulata, Hegetotheriidae). Remains were recovered from floodplain deposits of the Monte Hermoso Formation (early Pliocene). Francolite is the main mineral component in all hemimandibles, evidencing compositional changes in the internal crystalline structure during fossil-diagenesis. The similarity in the chemical composition of the fossils and the hosting rocks suggests that the enrichment of the remains with new elements was due to direct exchange with the sediments in which they were buried. Original bone microstructure shows good preservation, only affected by permineralization and microfissures. Manganese and iron oxides are the most abundant minerals infilling microstructural features and microfissures. The dark color identified on the outer surface of some remains is related to precipitation of manganese oxides. The results obtained allow us to establish the processes affecting the remains before and after burial, and thus interpret the different taphonomic histories. This work provides new information on a issue usually not considered in studies on vertebrate communities from the South American Neogene and at the same time it establishes a framework for the analysis of assemblages with similar characteristics.


Estudios Geologicos-madrid | 2000

Los marsupiales (Mammalia) del Mioceno Superior de la Formación Cerro Azul (Provincia de La Pampa, Argentina)

Francisco Javier Goin; Claudia I. Montalvo; Graciela Visconti


Palaeogeography, Palaeoclimatology, Palaeoecology | 2010

Large striated burrows from fluvial deposits of the Neogene Vinchina Formation, La Rioja, Argentina: A crab origin suggested by neoichnology and sedimentology

Ricardo N. Melchor; Jorge F. Genise; Juan L. Farina; Maria Victoria Sanchez; Laura C. Sarzetti; Graciela Visconti


Sedimentary Geology | 2008

Mechanisms of aggradation in fluvial systems influenced by explosive volcanism: An example from the Upper Cretaceous Bajo Barreal Formation, San Jorge Basin, Argentina

Aldo M. Umazano; Eduardo S. Bellosi; Graciela Visconti; Ricardo N. Melchor


Geobios | 2008

Vertebrate taphonomy in loess-palaeosol deposits: A case study from the late Miocene of central Argentina

Claudia I. Montalvo; Ricardo N. Melchor; Graciela Visconti; Esperanza Cerdeño


Cretaceous Research | 2009

Sedimentary record of a Late Cretaceous volcanic arc in central Patagonia: petrography, geochemistry and provenance of fluvial volcaniclastic deposits of the Bajo Barreal Formation, San Jorge Basin, Argentina

Aldo M. Umazano; Eduardo S. Bellosi; Graciela Visconti; Guillermo Jalfin; Ricardo N. Melchor


Journal of South American Earth Sciences | 2012

Detecting allocyclic signals in volcaniclastic fluvial successions: Facies, architecture and stacking pattern from the Cretaceous of central Patagonia, Argentina

Aldo M. Umazano; Eduardo S. Bellosi; Graciela Visconti; Ricardo N. Melchor


Palaeogeography, Palaeoclimatology, Palaeoecology | 2012

Palaeonvironmental and palaeoecological significance of flamingo-like footprints in shallow-lacustrine rocks: An example from the Oligocene–Miocene Vinchina Formation, Argentina

Ricardo N. Melchor; María Cristina Cardonatto; Graciela Visconti


Palaeogeography, Palaeoclimatology, Palaeoecology | 2016

The Celliforma ichnofacies in calcareous paleosols: An example from the late Miocene Cerro Azul Formation, La Pampa, Argentina

María Cristina Cardonatto; Renata Sostillo; Graciela Visconti; Ricardo N. Melchor


Ameghiniana | 2003

Nuevos registros de Dasypodidae (Xenarthra) en la Formación Cerro Azul (Mioceno tardío) de Caleufú, La Pampa, Argentina

Graciela Esteban; Norma Nasif; Claudia I. Montalvo; Graciela Visconti

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Ricardo N. Melchor

Facultad de Ciencias Exactas y Naturales

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Aldo M. Umazano

National Scientific and Technical Research Council

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Claudia I. Montalvo

Facultad de Ciencias Exactas y Naturales

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Eduardo S. Bellosi

National Scientific and Technical Research Council

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María Cristina Cardonatto

Facultad de Ciencias Exactas y Naturales

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A. Martín Umazano

Facultad de Ciencias Exactas y Naturales

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A. Parras

National Scientific and Technical Research Council

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Esperanza Cerdeño

National Scientific and Technical Research Council

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J. Marcelo Krause

National Scientific and Technical Research Council

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Jorge F. Genise

National Scientific and Technical Research Council

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