Graciela Susana BressanUniversidad de Buenos Aires | UBA · Department of Geology
Graciela Susana Bressan
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Publications (59)
En este resumen se describen los ejemplares de
Haentzschelinia ottoi (Geinitz, 1849) de la Formación Lajas
en la localidad de arroyo Carreri, 30 km al oeste de la
ciudad de Zapala, donde se reconocen unos 600 m de
areniscas y conglomerados de un delta dominado por
acción fluvial, que en algunos tramos presenta influencia
de mareas. En esta sección,...
La Revista de la Asociación Geológica Argentina es una fuente de consulta obligatoria para comprender la geología de nuestro país. Muchos trabajos de trascendencia han sido publicados en la revista desde su creación en 1945. Su propósito original era difundir la labor científica de los miembros de la asociación, pero rápidamente la revista pasó a c...
A new species of Protaxius Beurlen, P. paucisaetosus sp. nov., is erected on the basis of 40 specimens from a single stratigraphic level within the Agrio Formation (lower Hauterivian) in the Neuquén Basin. Specimen preservation varies from isolated chelae to complete exoskeletons, all invariably enclosed in concretions. Since the genus Protaxius ha...
This special issue focused on recent advances of the Jurassic System in Argentina was inspired by works presented and discussed during the 7th Argentine Symposium of the Jurassic held in 2019 at Ciudad Autónoma de Buenos Aires, Argentina. Twenty years have passed this year since the initial conception of the First Argentine Symposium of the Jurassi...
A total of 22 concretions containing 37 decapod crustacean specimens belonging to the family Axiidae, from the Hauterivian (Lower Cretaceous) of the Agrio Formation in the Neuquén Basin, were studied. The decapods were assigned to Protaxius sp., which likely had a fossorial life habit. In this work we attempt to determine, through taphonomic analys...
Two new isocrinids are described from the Lower Cretaceous Agrio Formation of the Neuquén Basin, west-central Argentina. Isocrinus (Chladocrinus) covuncoensis n. sp. is based on several beautifully preserved specimens from Valanginian beds of the Pilmatué Member. It is characterized by a small size, multiramose crown with six arm divisions, 240 arm...
La Manga Formation is a vast carbonate system developed in the Neuquén Basin. The age is based in ammonite faunas, ranging from Early Callovian (Bodenbenderi-Proximum Zone) to Middle Oxfordian (Cordatum Standard Zone to Transversarium Standard Zone, and probably to the lower part of the Bifurcatus Standard Zone). A stratigraphical and sedimentologi...
En un trabajo previo sobre corales fósiles del Jurásico Superior de la Cuenca Neuquina, en la provincia de Mendoza, se definió una escala tafonómica que permite agrupar a los especímenes estudiados en cuatro estados preservacionales según el grado de alteración tafonómica sufrido por los caracteres microestructurales usados en taxonomía. Estos esta...
A partir de analizar las morfologías funcionales de las distintas colonias de coral presentes por encima y por debajo de una superficie de discontinuidad (paleokarst) en afloramientos de la Formación La Manga (Oxfordiano) en la localidad de Bardas Blancas (Cuenca Neuquina, Pcia. de Mendoza), se reconocieron dos asociaciones con claras diferencias e...
Lumbricaria Münster is described for the first time outside the Tethys domain from distal facies of the Tithonian Vaca Muerta Formation, Neuquén Basin, Argentina. The studied material consists of elongate, convolute, cylindrical coprolites, showing an overlapping pattern, and commonly exhibiting constrictions. Internally, coprolites show a densely...
Lumbricaria Münster is described for the first time outside the Tethys domain from distal facies of the Tithonian Vaca Muerta Formation, Neuquén Basin, Argentina. The studied material consists of elongate, convolute, cylindrical coprolites, showing an overlapping pattern, and commonly exhibiting constrictions. Internally, coprolites show a densely...
The coral patch reef of the La Manga Formation at Bardas Blancas (Mendoza Province) is a good example of this kind of structure for the Upper Jurassic (Oxfordian) of the Neuquén Basin. In previous reports, four different genera of corals were identified: Actinastrea, Australoseris, Garateastrea, and Thamnasteria. A new systematic revision of the pr...
Se presentan resultados de un análisis tafonómico realizado sobre ostras del género Aetostreon Bayle registradas sobre una paleosuperficie expuesta en el perfil Cuesta del Chihuido de la Formación Chacho en Mendoza. Dicha superficie se ubica estratigráficamente justo por debajo de la base de la suprayacente Formación Agrio. Las otras se disponen en...
The cuticle of four specimens of Protaxius isochela Woodward (Axiidea, Axiidae) contained in ellipsoidal carbonate concretions was studied with the objective of knowing its composition and ultrastructure. They come from a thin interval of fine sandstones of the marine mixed platform of the Agrio Formation (early Hauterivian). SEM and EDS analysis w...
Se presentan resultados de un análisis tafonómico realizado sobre ostras del género Aetostreon Bayle registradas sobre una paleosuperficie expuesta en el perfil Cuesta del Chihuido de la Formación Chacho en Mendoza. Dicha superficie se ubica estratigráficamente justo por debajo de la base de la suprayacente Formación Agrio. Las otras se disponen en...
A parataxonomic, taphonomic, and biostratigraphic study of the calcispheres from the Vaca Muerta Formation (Tithonian) was carried out at the Arroyo Covunco section (Zapala, Neuquén province). We considered 215 specimens from 20 fertile samples collected every 3-10 m along 150 m of outcrop. The identified association includes 5 genera and 8 species...
A total of 22 cm-sized elipsoidal carbonate concretions containing axiid decapod specimens were studied. They proceed from a thin interval of fine sandstones of the Agrio Formation (Neuquén Basin, west-central Argentina) of early Hauterivian age, based on associated ammonoids. All specimens belong to Protaxius isochela Woodward (Axiidea, Axiidae)....
Paleokarst facies in la Manga Formation (middle Oxfordian), southern Mendoza province. Studies carried out in different outcrops of La Manga Formation (middle Callovian-middle Oxfordian) in southern Mendoza province, have allowed the recognition of an internal discontinuity characterized by the presence of a paleokarst. This surface was mentioned b...
Studies carried out in different outcrops of La Manga Formation (middle Callovian-middle Oxfordian) in southern Mendoza province, have allowed the recognition of an internal discontinuity characterized by the presence of a paleokarst. This surface was mentioned by Groeber as alveolar limestones. He also recognized surfaces displaying shades of yell...
La evolución del sistema depositacional de esta unidad en el sur mendocino (Bardas Blancas) muestra una notable somerización que culmina con facies arrecifales. Su techo se encuentra afectado por una superficie paleokárstica que evidencia cambios drásticos en las condiciones ambientales. El ascenso del nivel del mar, posterior a este límite de secu...
Los corales que conforman el framework arrecifal de esta unidad están representados por los géneros Australoseris Morsch, 1990, Garateastrea Morsch, 1996, Thamnasteria Lesauvange, 1823 y Stelidioseris Tomes, 1893. Ejemplares de este último habían sido asignados anteriormente a Actinastrea d’Orbigny, 1849. El análisis cuantitativo de datos recolecta...
Los estudios sobre la Formacion La Manga (Caloviano medio-Oxfordiano medio) en diferentes depocentros en el surmendocino han permitido reconocer la presencia de una discontinuidad interna caracterizada por procesos paleokársticos. Esta superficie aparece en el techo de las facies arrecifales y barreras oolíticas que definen una clara sucesión somer...
Este trabajo forma parte de un estudio paleoecológico y taxonómico realizado en el sistema arrecifal de la Formación La Manga (Calloviano-Oxfordiano) en uno de sus afloramientos de la localidad de Bardas Blancas, en el departamento de Malargüe (provincia de Mendoza). En el mismo se revisaron los corales constituyentes del framework arrecifal y pudi...
Exceptionally preserved stromatolites have been found in the shallow marine carbonate facies of the Callovian-Oxfordian La Manga Formation, in the Neuquén Basin (Argentina). The stromatolites exhibit planar and crinkle lamination, often disrupted by sheet-cracks, mudcracks, and fenestral structures, which indicate periodic subaerial exposure. These...
The Callovian-Oxfordian of the Neuquén Basin (Argentina) is characterized by an extensive marine carbonate system (La Manga Formation) with a predominance of shallow and middle ramp deposits, although locally in tectonically controlled settings, deeper deposits also formed. These middle Oxfordian deeper deposits consist of mudstone-wackestone carbo...
The aims of the present work are to present a preliminary morphological description and
palaeobiogeographical affinities of stalked crinoids recorded from the Lower Cretaceous of the
Neuquén Basin, west-central Argentina. The studied specimens proceed from the Agrio Formation
in two different stratigraphic positions and facies relationships. Most o...
A core obtained at 100 m water depth in the outer shelf of southeastern Buenos Aires is described. It contains a sedimentary sequence in transgressive facies that records for the first time in the region the evolution of barriers-coastal lagoon environments during the last part of Marine Isotope Stage 2 with an age ca. 15 ka cal AP.
A core obtained at 100 m water depth in the outer shelf of southeastern Buenos Aires is described. It contains a sedimentary sequence in transgressive facies that records for the first time in the region the evolution of barriers-coastal lagoon environments during the last part of Marine Isotope Stage 2 with an age ca. 15 ka cal AP.
The Callovian-Oxfordian of the Neuquén Basin (Argentina) is characterized by an extensive marine carbonate system (La Manga Formation) with a predominance of shallow and middle ramp deposits, although locally in tectonically controlled settings, deeper deposits also formed. These middle Oxfordian deeper deposits consist of mudstone-wackestone carbo...
The La Manga Formation consists of marine carbonates and represents most of the sedimentary record of the Callovian-Oxfordian in the Neuquén Basin. Three localities in the southern Mendoza province were studied and their cyclicity was determined by means of facies analysis and their vertical arrangement. Facies of inner ramp, that were deposited in...
Strata of the Bardas Blancas Formation (lower Toarcianelower Bajocian) are exposed in northern Neu-quén Basin. Five sections have been studied in this work. Shoreface/delta front to offshore deposits predominate in four of the sections studied exhibiting a high abundance of hummocky cross-stratified, horizontally bedded and massive sandstones, as w...
Exceptionally preserved stalked crinoids have been recorded from Valanginian beds of the Agrio Formation in the Neuquén Basin. The crinoid beds occurred within a 30-m thick succession consisting of cross-bedded sandstones and mixed sediments. Cross-bedded sets are up to 5 m thick and the crinoid beds are invariably associated with reactivation surf...
The La Manga Formation constitutes most of the sedimentary record of the Callovian-Oxfordian in the Neuquén Basin. This stratigraphic unit represents the middle part of the Lotena Mesosequence, which is dominated by carbonates with interbedded shales, marls, and occasional sandstones. Based on detailed stratigraphic work in the stratotype section (...
Griphaeid-dominated fossil concentrations of La Manga Formation are characterized on the basis of taphonomic, sedimentologic, stratigraphic and palaeoecologic criteria. These concentrations are present in the basal deposits (Unit 1) of three outcrops in the locality of Bardas Blancas. Their attributes allow distinguishing seven different fossil acc...
Trace fossil associations from the Lower-Middle Jurassic siliciclastic succession of the northern Neuquén Basin, Argentina are described and their palaeoenvironmental interpretation is discussed. The Bardas Blancas Formation displays facies of lower foreshore to offshore environments, such as massive and laminated mudstones, laminated siltstones, h...
Facies and microfacies of the Tithonian-Berriasian ramp from the Neuquén basin (Vaca Muerta Formation) in the Loncoche creek sect- ion - Malargüe, Mendoza. Facies association of the Tithonian-Berriasian Vaca Muerta Formation from the Loncoche creek sec- tion, Neuquén Basin, west central Argentina, allow the distinction and definition of 12 lithofac...
The Bardas Blancas Formation (Toarcian-Bajocian) of the Neuquen Basin in no Potimalal area is characterized on the basis of sedimentologic, taphonomic and ichnologic criteria. The taphonomic attributes and their relation to the lithofacies allow us to distinguish five different bioclastic deposits (BD): (1) BD1, hummocky cross-stratified shell conc...
The Lower Cretaceous Chachao Formation in the Malargüe anticline area consists of wackestone, packstone, and minor grainstone and mudstone rich in benthonic fauna that were deposited in a carbonate ramp. The carbonate diagenesis in the Valanginian Chachao Formation contains many processes with conspicuous effects, including micritization, dissoluti...
The Lower Cretaceous Chachao Formation in the Malargüe anticline area consists of wackestone, packstone, and minor grainstone
and mudstone rich in benthonic fauna that were deposited in a carbonate ramp. The carbonate diagenesis in the Valanginian
Chachao Formation contains many processes with conspicuous effects, including micritization, dissoluti...
Facies association of the Tithonian-Berriasian Vaca Muerta Formation from the Loncoche creek section, Neuquén Basin, west central Argentina, allow the distinction and definition of 12 lithofacies and 8 microfacies, which are dominated by molluscs, echinoderms, foraminifera, brachiopods, serpulids and radiolarians. The Vaca Muerta Formation consists...
El estudio de los carbonatos calovianos de la Formación Calabozo (30 m) procedente del centro-oeste de Argentina revela la abundancia de partículas carbonáticas bentónicas producidas por organismos fotodependientes y de granos no-esqueletales tales como ooides y peloides. La biota está representada por bivalvos, dasicladáceas (Salpingoporella annul...
Osagids-types oncoids from La Manga Formation and their paleoecological significance, La Vaina Creek, Mendoza. Microbial oncoids have been found in the Oxfordian limestones of the La Manga Formation in the La Vaina section at Potimalal River, Mendoza province. The oncoids ocurr either in packstone or floatstone-rudstone or are scattered in the wack...
Detailed study of Callovian carbonates of the Calabozo Formation (30 m) in western Argentina, reveals the abundance of benthic carbonates particles produced by organisms that are light dependent, and non-skeletal grains such as ooids and peloids. The biota consists of bivalves, dasyclads (Salpingoporella annulata Carozzi, Cylindroporella annulata C...
