Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

The ar ticle examines the authorship of six monumental statues in two sets from the Ibero-American Exhibition in Seville in 1929, assigned by artistic historiography to the sculptors Antonio Bidón and Pedro Navia, or to Francisco Navarro and José Macías, respectively. Given that none of the art historians who cited them gave documentary references or provided formal analyses to confirm the assignments, these authorships remained uncertain. The article presents the findings obtained from the records of the said events preserved in the Municipal Archive of Seville and a subsequent formal study aimed at recognizing the characteristics of the statues and clarifying the identities of the possible authors.

 Recientes excavaciones en la ciudad huaxteca de Tamtoc, San Luis Potosí, permitieron identificar vestigios arqueológicos muy importantes para entender el origen y la evolución cultural del pueblo que habitó esta urbe, desde la época preclásica. El Monumento 32 (M32) de Tamtoc es un espectacular monolito labrado con un mensaje simbólico sui géneris que no se asemeja a ninguna otra muestra de arte mesoamericano. A partir de la información etnográfica recopilada en la población huaxteca se proponen varias interpretaciones de la escena labrada. Se analiza la orientación de M32 una vez que fue colocada en su posición original. El frente labrado de M32 posee una orietación que implica una peculiar división del año definiendo la temporada de iluminación del monolito por los rayos solares. Se concluye que Tamtoc es una de las ciudades donde tempradamente se utilizó el calendario mesoamericano.

In the convulsive last third of the twentieth century in Mexico, an audiovisual practice emerged concerned with reporting on political issues, tending towards alternative media such as video. Throughout the eighties and especially at the turn of the century, video renewed artistic language and became a useful tool to respond to the panorama of neoliberal transformations that transformed the Mexican urban and living landscape (especially for women). Along the way, Mexican video gave a voice to bodies and collectives that did not find it in official channels. Without pretending to be a macro-narrative, but rather offering a possible itinerary by observing the link between city, body and social criticism, this article presents a journey through some of the works and key names that provided a reflective documentation of this decisive period.

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Mafic monogenetic volcanoes and salt pans or salars are ubiquitous in the Puna plateau of the Central Andes. In this contribution, we present the study of two Pleistocene mafic monogenetic centers, the Panqueque center emplaced on the western margin of the Salar de Arizaro and the Medialuna center emplaced within the same salar. Both centers had initial explosive phreatomagmatic activity that progressed to explosive magmatic (Strombolian) activity and ended with effusive activity. However, differences in magma flux, bedrock composition, and magma-water interaction resulted in deposits with different volumes and characteristics and, consequently, varied landforms. The magma batch that formed the Panqueque center (0.098 km3) passed through a heterogeneous bedrock marked by the transition between clastic and evaporitic deposits. Variable magma-water interaction generated two stages of phreatomagmatic activity, producing first a tuff ring or rings and then tuff cones, followed by Strombolian activity. Activity culminated with two phases of volumetrically dominant lava flows. In contrast, the much smaller Medialuna center (0.00016 km3) was formed by a magma batch that ascended through the mostly homogeneous halite-rich core of the salar. The magma interacted with water-saturated evaporitic sediments and fragmented close to the surface, generating a small asymmetric tuff ring. A minor final stage of magmatic activity consisted of ballistic fall activity and a lava cap at the conduit. The Panqueque center pyroclastic deposits do not show any specific feature that alludes to the salar environment, possibly because they formed at the salar margin where alluvial clastic sediments are abundant. Conversely, the Medialuna center deposits do have a few features, namely the lack of lithics, the possible total disintegration of the mechanically weak and friable evaporites into fine to very fine ash particles, and the presence of aggregates cemented by gypsum/salts that may be diagnostic of salar-related phreatomagmatic activity.

We present a comprehensive geological mapping of the northern sector of the Rincón de la Vieja volcano, which includes the surveying of stratigraphic sections and new radiocarbon sampling, to provide an updated understanding of its volcanic history over the past 35,000 years. This study identifies a sequence of ancient lahars, lava flows, pyroclastic density currents (PDCs), and Plinian/sub-Plinian tephra fall deposits, with ages older than ~8,300 years BP, possibly sourced from the westernmost craters. Since then, an erosive unconformity suggests a significant period of explosive inactivity lasting at least 2,000 years. The most recent effusive event of importance occurred at around 5,300 years BP, forming the Gavilán lava field. A particularly noteworthy Plinian eruption, resulting in the Río Blanco Tephra sequence, deposited pumice to the west and southwest of the volcano and PDCs on its northern flank, extending up to at least 8.5 km. This explosive event, the largest in the last ~5,000 years, likely caused substantial modifications to the crater area, including its destruction and enlargement. Radiometric age data suggest that the Río Blanco event occurred at around 1650-1746 cal yr BP. This study enhances the understanding of the Late Pleistocene-Holocene eruption history of Rincón de la Vieja, providing valuable insights for volcanic hazard assessment and risk management.

The plectorthoid brachiopod Kvania is widely distributed in Upper Cambrian and Lower Ordovician rocks of the Central Andean basin of northwestern Argentina and southwestern Bolivia. In this contribution, Kvania lariensis Benedetto is reported for the first time in the Eastern Cordillera (Quebrada de Humahuaca area) of northwestern Argentina. Studied material comes from the Alfarcito Member of the Santa Rosita Formation (Santa Victoria Group) of well constrained earliest Tremadocian age (Tr1). The presence of Kvania lariensis in different localities of the Altiplano-Puna region and the Eastern Cordillera of Bolivia and Argentina allows proposing this species as a reliable biostratigraphic marker for the lowermost Ordovician of the region. On the basis of the phylogenetic hypothesis supporting the Protorthisina-Kvania-Gondwanorthis lineage, four phylozones are recognized across the Cambrian-Ordovician boundary. The basal member of the lineage is Kvania primigenia, which co-occurs with Parabolina (Neoparabolina) frequens argentina, is proposed here as a biostratigraphic marker for the upper Furongian (Stage 10). The base of the time slice Tr1 is indicated by the first appearance of Kvania lariensis, which is almost time-equivalent to the Jujuyaspis keideli trilobite biozone, whereas the descendent species Kvania azulpampensis is almost coeval with the Kainella andina trilobite biozone. Gondwanorthis calderensis calderensis, a more derived member of the lineage, indicates the upper part of the lower Tremadocian (Tr1), and is equivalent to the Kainella meridionalis trilobite biozone. The specimens of Kvania lariensis from the Alfarcito Member provide additional information about its phenotypic variablity, confirming the trend of increasing costellae number through ontogeny observed in the type material, and also corroborate that the lineage as a whole experienced a defined evolutionary trend to increasing both shell size and costellae number.

The wetlands along the Leyes-Tulumaya stream in central-western Argentina (32° S) are part of an old, inactive paleo-stream bed of the Mendoza River. These wetlands have been drastically impacted during the last 20 years, reducing their water areas or even completely drying out. The causes and driving factors of this major environmental impact have yet to be explored. Understanding the interaction of the different natural and/or anthropic factors influencing these wetland area changes in the recent past is imperative to apply proper management and conservation plans. In this contribution, the water areas of three lakes along the Leyes-Tulumaya stream are mapped using a GIS environment from satellite imagery to track variations in the last two decades. Assuming that natural variables have been forcing these environmental changes, annual precipitation, soil moisture, evaporation indexes, and the stream flow of the Mendoza River, are analyzed. Changes in the lake water areas along the Leyes-Tulumaya stream are, however, hardly explained due to these natural variables, so anthropogenic factors might have been key and thus need to be further explored.

With the main goal of reconstructing the environmental conditions of the Cuyo and Lotena groups during the Middle Jurassic period in the south of the Huincul Arch (central western Argentina), a multi-proxy approach, considering pollen, spores, algae, fungal remains, palynofacies, molluscs, ichnology, X-Ray diffraction, and petrographic and lithological analyses, was carried out. This work suggests a lacustrine environment for the Challacó Formation, shallow marine conditions influenced by strong fluvial discharges for the Lajas, Bosque Petrificado and Lotena formations, and an age no older than latest Early Bajocian for the uppermost part of the Lajas Formation.