Article
Plant Sciences
Edlley M. Pessoa, Alexandre C. Ribeiro, Maarten J. M. Christenhusz, Alessandra Ike Coan, Nathan A. Jud
Summary: This study provides a new interpretation of a fossil genus, Santaniella, as belonging to the magnoliid clade instead of the presumed Ranunculaceae. The researchers used a new fossil specimen and conducted a phylogenetic analysis using morphological and DNA sequence data. The results indicate that Santaniella is an angiosperm but its combination of characters does not strongly support a close relationship to any extant order of flowering plants.
AMERICAN JOURNAL OF BOTANY
(2023)
Article
Geology
W. C. Clyde, J. M. Krause, F. De Benedetti, J. Ramezani, N. R. Cuneo, M. A. Gandolfo, P. Haber, C. Whelan, T. Smith
Summary: The La Colonia Formation in Patagonia, Argentina preserves important vertebrate and plant fossils, but its precise age and stratigraphic relationship to the K-Pg boundary are not well understood. Through a combination of magnetostratigraphy, U-Pb geochronology, and palynology, this study suggests that the formation may preserve the K-Pg boundary, providing valuable insights into the extinction and recovery dynamics in South America.
CRETACEOUS RESEARCH
(2021)
Article
Geology
D. Moyano-Paz, S. Rozadilla, F. Agnolin, E. Vera, M. D. Coronel, A. N. Varela, A. R. Gomez-Dacal, A. M. Aranciaga-Rolando, J. D'Angelo, V. Perez-Loinaze, S. Richiano, N. Chimento, M. J. Motta, J. Sterli, M. Manabe, T. Tsuihiji, M. P. Isasi, D. G. Poire, F. E. Novas
Summary: The Chorrillo Formation deposits in southern Patagonia, Argentina, accumulated during a 'continental window' in the Late Cretaceous, with new vertebrate and plant fossils described. Analysis identified five architectural elements, separated into channelized and non-channelized units, representing a fine-grained dominated fluvial depositional system. The fossils include new taxa such as frogs, snakes, turtles, dinosaurs, and birds, shedding new light on the faunistic composition and paleobiogeography of Gondwana's high-latitude biotas.
CRETACEOUS RESEARCH
(2022)
Article
Geology
Guillermo J. Windholz, Mattia A. Baiano, Flavio Bellardini, Alberto Garrido
Summary: Dicraeosauridae is a family of small body-sized sauropod dinosaurs with elongated bifid neural spines on the dorsal vertebrae. The new dicraeosaurid remains discovered from the La Amarga Formation have enriched the fossil record of this group.
CRETACEOUS RESEARCH
(2021)
Article
Geology
Andrea De Sosa Tomas, Carles Martin-Closas, Patricia Vallati
Summary: This study describes and illustrates the charophyte assemblages from the Pozo D-129 Formation in Sierra Silva, Golfo San Jorge Basin. Three charophyte species belonging to the families Characeae and Clavatoraceae are documented. The composition of the charophyte floras is related to changing paleoecological conditions from temporary, unstable water bodies to more stable and permanent lake conditions. The charophyte assemblages provide information about the age and paleobiogeographic history of certain taxa in the Lower Cretaceous deposits of the basin.
CRETACEOUS RESEARCH
(2023)
Article
Plant Sciences
Valeria S. Perez Loinaze, Ezequiel I. Vera, Damian Moyano-Paz, Marina D. Coronel, Makoto Manabe, Takanobu Tsuihiji, Fernando E. Novas
Summary: A palynological analysis of the Chorrillo Formation in Patagonia suggests a diverse record of continental vertebrates, invertebrates, and plants, indicating humid and warm climatic conditions during the Maastrichtian age.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2023)
Article
Geology
Masaki Matsukawa
Summary: This study describes the ammonite assemblage from the Sanchu Cretaceous, including the species composition, biostratigraphy, and paleobiogeography.
CRETACEOUS RESEARCH
(2022)
Article
Chemistry, Analytical
Norah Salem Alsaiari, Muhammad Ahmad, Irum Shaheen, Ijaz Ali, Umay Amara, Fatimah Mohammed Alzahrani, Sayed M. Eldin, Waqas Ul Arifeen, Tae Jo Ko, Iftikhar Hussain
Summary: In this study, composites based on ZnO/NiO were successfully fabricated and exhibited high specific capacity and long stability as electrode materials for supercapacitors. The synthesized 3D flower-shaped ZnO/NiO composite was characterized using various techniques. The electrochemical measurements showed that the highest specific capacity of 350 C g-1 was achieved at 2 A g-1 current, while the lowest specific capacity of 217 C g-1 was observed at 20 A g-1. After 8000 GCD cycles, the 3D flower-shaped ZnO/NiO electrode demonstrated a cyclic stability of 72.1% capacitance retention and 97.1% Coulombic efficiency.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Geology
Masaki Matsukawa
Summary: This study describes twenty Aptian ammonite species, including one new genus and three new species, from the Todai Formation in central Japan. The ammonite fauna of the Todai Formation is divided into one horizon and two biostratigraphic zones, which are correlated with Upper Aptian standard zonation in various regions. The fauna includes ornate planispiral forms, smooth or weakly ornate planispiral forms, and heteromorph forms, with a nearly even ratio of morphotypes similar to the Aketo Formation in the Miyako Group.
CRETACEOUS RESEARCH
(2021)
Article
Geology
Yang Zhang, James G. Ogg, Daniel Minguez, Mark W. Hounslow, Snorre Olaussen, Felix M. Gradstein, Selen Esmeray-Senlet
Summary: The age of the beginning of magnetic polarity Chron M0r, proposed as a marker for the base of the Aptian Stage, is disputed due to divergence in published radioisotopic dates. A study in Svalbard, Norway, calibrated a bentonite bed using U-Pb methods, leading to a younger estimate for the beginning of Chron M0r and indicating a faster global oceanic spreading rate during the Aptian-Santonian interval. Further research is needed to expand the mid-Jurassic to earliest Cretaceous interval by the required 4 million years.
Article
Multidisciplinary Sciences
Alexis M. Aranciaga Rolando, Matias J. Motta, Federico L. Agnolin, Makoto Manabe, Takanobu Tsuihiji, Fernando E. Novas
Summary: This study describes a partial skeleton of a megaraptorid from the Maastrichtian beds in Argentina, which is the most informative megaraptoran known from this time period and is identified as a new taxon. Phylogenetic analysis shows that South American megaraptorans form a monophyletic clade, while Australian and Asian members are stem groups. South American megaraptorans differ from more basal forms in several anatomical features and are larger and more robustly built.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Baoxia Du, Mingzhen Zhang, Bainian Sun, Aijing Li, Jing Zhang, Defei Yan, Sanping Xie, Jingyu Wu
Summary: Gansufructus saligna gen. et sp. nov. is a fossil eudicot plant discovered in the Early Cretaceous of Gansu Province, Northwest China, with alternate leaves, short petioles, linear-lanceolate shape, and carpels containing three to five seeds. Its leaf and axis characteristics suggest a terrestrial herbaceous habit.
NATIONAL SCIENCE REVIEW
(2021)
Article
Geology
Y. Rojas-Agramonte, H. Y. Hu, M. Iturralde-Vinent, J. Lewis, B. Mercier de Lepinay, A. Garcia-Casco
Summary: This study presents new U-Pb zircon age and geochemical data from an intermediate talc-alkaline pluton in NW Hispaniola, shedding light on the Late Cretaceous development and geological evolution of the Greater Antilles Arc. The data suggest a connection between rocks with adakitic affinities in Eastern Cuba, Haiti, and Dominican Republic, and reveal potential ridge subduction and triple point migration during the Late Cretaceous to early Tertiary period.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geosciences, Multidisciplinary
Teal R. Riley, Alex Burton-Johnson, Michael J. Flowerdew, Fernando Poblete, Paula Castillo, Francisco Herve, Philip T. Leat, Ian L. Millar, Joaquin Bastias, Martin J. Whitehouse
Summary: The Antarctic Peninsula has preserved evidence of a long-lived continental margin with various geological units, suggesting a convergent margin setting from the Cambrian to the Cenozoic. Through the use of geochronology and field evidence, along with detailed kinematic reconstructions, the relationships between geological units and tectonic events in Patagonia and the proto-Antarctic Peninsula have been established. The Gondwana/Pangea continental margin experienced crustal block translation, deformation, magmatic pulses, and development of thick accretionary complexes, which were influenced by subducting slab dynamics.
EARTH-SCIENCE REVIEWS
(2023)
Article
Multidisciplinary Sciences
Damares Ribeiro Alencar, William Santana, Allysson Pontes Pinheiro, Daniel Lima, Antonio Alamo Feitosa Saraiva, Gustavo Ribeiro de Oliveira
Summary: We describe a new stenopodidean shrimp, Dubiostenopus parvus n. gen. n. sp., from the Romualdo Formation of Brazil. This is the first stenopodidean shrimp described from the Romualdo Formation and South America. The specimen is approximately 10 mm in length with a robust cephalothorax and well-developed cheliped.
Article
Geosciences, Multidisciplinary
V. S. Perez Loinaze, S. R. Giordano, C. O. Limarino
Summary: A lithofacial and palynological study was conducted on the Can?ad?on Seco Formation in the La Frieda Oeste x-1 well in the Golfo San Jorge Basin, revealing four main lithofacies and suggesting a Turonian?Coniacian age based on the palynological assemblage. The study indicates temperate to warm and humid conditions during a little known period in the evolution of angiosperms in the southern region of Gondwana.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Oscar Lopez-Gamundi, Carlos O. Limarino, John L. Isbell, Kathryn Pauls, Silvia N. Cesari, Pablo J. Alonso-Muruaga
Summary: The southwestern margin of South America presents a comprehensive record of the Late Paleozoic Ice Age (LPIA) that affected the Gondwana supercontinent, refined into five discrete glacial events primarily occurring in marine environments. The paleofjord model has been confirmed in the Protoprecordillera with stages of valley incision, subglacial diamictite deposition, early and late transgressive events, and highstand with deltaic progradation. This glacial chronology reflects common tripartite motifs and is characterized by deglaciation sequences transitioning into postglacial conditions, demonstrating the complex interplay between glacial and marine processes in the region.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Plant Sciences
Silvia N. Cesari, Carlos O. Limarino, Sergio Marenssi, Patricia L. Ciccioli, Fanny C. Bello, Luis C. Ferreira, Leonardo R. Scarlatta, Richard Friedman
Summary: Palynology is a useful tool for constructing biostratigraphic charts in late Paleozoic South American basins. This study focuses on describing new Argentinian palynological assemblages and applying a new isotopic age to constrain the age of the LW Biozone in the Paganzo Basin. The study enables more confident large-scale correlations with neighboring basins and provides insight into the composition of the Lueckisporites virkkiae record in Gondwana.
Article
Geology
D. Moyano-Paz, S. Rozadilla, F. Agnolin, E. Vera, M. D. Coronel, A. N. Varela, A. R. Gomez-Dacal, A. M. Aranciaga-Rolando, J. D'Angelo, V. Perez-Loinaze, S. Richiano, N. Chimento, M. J. Motta, J. Sterli, M. Manabe, T. Tsuihiji, M. P. Isasi, D. G. Poire, F. E. Novas
Summary: The Chorrillo Formation deposits in southern Patagonia, Argentina, accumulated during a 'continental window' in the Late Cretaceous, with new vertebrate and plant fossils described. Analysis identified five architectural elements, separated into channelized and non-channelized units, representing a fine-grained dominated fluvial depositional system. The fossils include new taxa such as frogs, snakes, turtles, dinosaurs, and birds, shedding new light on the faunistic composition and paleobiogeography of Gondwana's high-latitude biotas.
CRETACEOUS RESEARCH
(2022)
Article
Geology
Ezequiel Ignacio Vera, Valeria Susana Perez Loinaze
Summary: The Punta del Barco Formation in Argentinian Patagonia is characterized by highly diverse and abundant megafloras containing some of the oldest evidence of angiosperms in the region. Fossil woods from this formation have been described and classified into two conifer families, reflecting ecological responses to volcanic activity. Fungal activity in the fossil woods is identified, indicating different types of interactions and decay processes.
CRETACEOUS RESEARCH
(2022)
Article
Plant Sciences
Silvia N. Cesari, Carlos O. Limarino, Patricia L. Ciccioli, Corey Wall
Summary: This study reports continuous fossil records from the upper Palaeozoic basins of central-western Argentina spanning the late Permian to early Triassic. The newly discovered palynofloras from the La Veteada Formation are identified as Lopingian in age and exhibit characteristics of post-Permian recovery plant assemblages worldwide. The use of a new uranium-lead chemical abrasion-isotope dilution-thermal ionization mass spectrometry (U-Pb CA-ID-TIMS) age confirms the Olenekian age of this stratigraphic unit and identifies the first Early Triassic palynofloras in the western Gondwana region.
Article
Geology
Ezequiel I. Vera, Valeria S. Perez Loinaze, Damian Moyano-Paz, Marina D. Coronel, Makoto Manabe, Takanobu Tsuihiji, Fernando E. Novas
Summary: Few latest Cretaceous fossil floras have been discovered in South America, particularly in the Austral-Magallanes Basin. This study describes the diverse fossil elements found in the Chorrillo Formation, including water lily remains, leaf impressions, and palynological samples. The findings reveal the presence of a diverse community in low energy freshwater environments during the Late Cretaceous.
CRETACEOUS RESEARCH
(2022)
Article
Geology
M. G. Passalia, A. Garrido, A. Iglesias, E. I. Vera
Summary: This study provides a geological characterization of the Valcheta Petrified Forest in Argentina and investigates the fossil logs found in the area. The findings suggest that the forest consisted of mature trees, predominantly of the Podocarpoxylon mazzonii species. This species, along with conifers, cycads, and palms, played an important role in the North Patagonian forest communities during the Campanian-Danian interval.
CRETACEOUS RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Luis A. Spalletti, Carlos O. Limarino, Ferran Colombo, Patricia L. Ciccioli, Carina E. Colombi
Summary: This study analyzes the behavior of the Valle Fe ' rtil Lineament, a structural element in northwest Argentina, during the late Paleozoic. Three different lines of research were followed, including the analysis of compositional changes, the interpretation of soft-sediment deformation, and the analysis of stratigraphic relationships. The study provides insights into tectonic instability and the presence of volcanic activity in the area.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Geology
M. Sol Raigemborn, Sabrina Lizzoli, Damian Moyano-Paz, Augusto N. Varela, Daniel G. Poire, Valeria Perez Loinaze, Ezequiel Vera, Makoto Manabe, Fernando Novas
Summary: This study conducted a paleopedological analysis of the Chorrillo Formation in southern Patagonia, Argentina. The results show that the paleosols in this formation are rich in smectite and exhibit vertical and redoximorphic features. Paleobotanical remains and climate proxies indicate a temperate-warm and seasonally humid climate during the formation of these paleosols.
CRETACEOUS RESEARCH
(2023)
Article
Plant Sciences
Valeria S. Perez Loinaze, Ezequiel I. Vera, Damian Moyano-Paz, Marina D. Coronel, Makoto Manabe, Takanobu Tsuihiji, Fernando E. Novas
Summary: A palynological analysis of the Chorrillo Formation in Patagonia suggests a diverse record of continental vertebrates, invertebrates, and plants, indicating humid and warm climatic conditions during the Maastrichtian age.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2023)
Article
Plant Sciences
Silvia N. Cesari, Carlos O. Limarino, Sergio Marenssi, Patricia L. Ciccioli, Fanny C. Bello, Luis C. Ferreira, Leonardo R. Scarlatta, Richard Friedman
Summary: This paper describes new Argentinian palynological assemblages in the late Paleozoic basins of South America, specifically focusing on the Lueckisporites/Weylandites (LW) Biozone. By applying a new isotopic age, the study enables more confident large-scale correlations with the neighboring Parana Basin of Brazil. The recovered palynofloras and the U-Pb CA-ID-TIMS age of 278.84 +/- 0.22 Ma provide important insights into the age constraints and correlations in the region.
Article
Geosciences, Multidisciplinary
David Dominguez-Santos, Daniel Valderrama, Ahmet Utku Yazgan
Summary: This document presents a study comparing the spectra of large-magnitude seismic records in Chile between 2012 and 2022 with the design spectra of NCh433 and D. S 61. The aim is to determine if Chile's seismic-resistant regulations are updated to the existing reality and propose new design spectra that better represent the seismic activity in Chile during the last decade.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Prabhu Palanisamy, Vivek Sivakumar, Priya Velusamy, Logesh Natarajan
Summary: Shoreline changes in the southern coast of Rio de Janeiro, Brazil, were analyzed from 1986 to 2018. The study found that both natural and human factors significantly impact shoreline changes. The findings provided important insights into predicting future shoreline positions and identifying vulnerable regions. Additionally, human activities were found to influence shoreline change models, emphasizing the need for effective management strategies to protect ecosystems and communities.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Irina Salgado Bernal, Periyasamy Sivalingam, Armando Martinez Sardina, Michel Manduca Artiles, Maria E. Carballo Valdes, John Pote
Summary: This study investigated the presence of 15 toxic metals in surface sediment in a tropical river ecosystem in Cuba. The results showed that the sediments had higher concentrations of four metals compared to Cuban norms. Various contamination indices were calculated, and correlations analysis revealed the main sources of contamination. The study provides important information for the management of the river and emphasizes the need for metal pollution control and monitoring.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Camila Morgan, Eduardo Morgado, Miguel-Angel Parada, Raimundo Brahm, Francisca Mallea-Lillo
Summary: Lanin volcano is a composite volcano in the Andes, which has erupted lava flows with different compositions. The volcano's magma reservoir contains a crystal mush, and the pre-eruptive conditions include temperature, pressure, and oxygen fugacity. Fractional crystallisation has led to the evolution of the magma with different compositions.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Benjamin Idini, Sergio Ruiz, Jean-Paul Ampuero, Felipe Leyton, Efrain Rivera
Summary: This study investigates the role of wedge integrity on the frequency content of strong ground motion produced by subduction earthquakes in Northern Chile. The results show that the frequency characteristics of seismic waves vary with hypocentral distance, indicating lateral variations in anelastic attenuation due to the heterogeneous tectonic structure.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
