Article
Geology
N. Foix, S. M. Ocampo, J. M. Paredes, J. O. Allard, R. E. Giacosa, P. D. Gonzalez, S. X. Olazabal
Summary: The Maastrichtian-Danian (K/P) transgression in northern-central extra-Andean Patagonia covered both Mesozoic sedimentary basins and the Northpatagonian Massif, resulting in a regional unconformity/nonconformity between the pre-Cretaceous base and the K/P marine transgressive record. The transgressive stratigraphic record over the basement is mainly composed of isolated carbonate bioclastic deposits and is interpreted as rocky shore associations. The colonization of engineer ecosystems organisms and the presence of a short-lived, transgressive, cool-water carbonate factory enhanced coastal biodiversity.
SEDIMENTARY GEOLOGY
(2023)
Article
Geography, Physical
Yitian Yin, Laiming Zhang, Xue Gu, Runsheng Yin, Yixiong Wen, Tianjie Jin, Chengshan Wang
Summary: This study reveals that the uppermost Cretaceous-lowermost Paleogene strata in the low-latitude Nanxiong Basin exhibit an extremely high mean annual terrestrial temperature, which may be attributed to the Deccan Traps volcanism and the extremely hot and arid regional climate.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geography, Physical
Azam Mahanipour, Joerg Mutterlose, Mohammad Parandavar
Summary: The study found that the K-Pg boundary is located in the uppermost part of a positive carbon isotope excursion, with signs of environmental stress recorded near the boundary. During the early Danian stage, indications of stressful and eutrophic surface water conditions were observed, but a temporary cooling phase was documented in the subsequent recovery phase.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geology
Tingting Yu, Sha Li, Rodrigo B. Salvador, Dangpeng Xi, Haichun Zhang, Xiaoqiao Wan
Summary: A study on the gastropod faunas from the Cretaceous-Paleogene (K/Pg) boundary transition in the Songliao Basin in China reveals that freshwater gastropods in East Asia experienced minor extinction, with a high survival rate. This study sheds light on patterns of selective extinction in freshwater environments.
CRETACEOUS RESEARCH
(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
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
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
Plant Sciences
Keith Berry
Summary: The traditional perspective attributing the first phase of the fern spike to a Cyathea-like fern has been challenged by recent investigations, which suggest a more common presence of Anemia-like ferns at the K/Pg boundary. Some ferns in western North America may have produced spores similar to those observed at the fern spore spike. These results may help explain the taxonomic differences in the fern spore spike between western North America and New Zealand.
INTERNATIONAL JOURNAL OF PLANT SCIENCES
(2021)
Review
Energy & Fuels
Lina Patricia Vega, Karen Tatiana Bautista, Heliana Campos, Sebastian Daza, Guillermo Vargas
Summary: This article focuses on the current situation of biofuel production and research development in Latin American countries such as Argentina, Brazil, Mexico, Chile, Costa Rica, and Colombia. Brazil stands out as a leader in the region, making significant advancements in clean energy production through biofuels policy implementation. The review highlights the challenges these countries face in utilizing their comparative advantages for biofuel production.
Article
Multidisciplinary Sciences
Catherine G. Klein, Davide Pisani, Daniel J. Field, Rebecca Lakin, Matthew A. Wills, Nicholas R. Longrich
Summary: The study combines molecular data, fossils, and biogeography to reveal the timing of snake diversification and dispersal in relation to the end-Cretaceous mass extinction. Mass extinctions have shaped global biodiversity, leading to rapid diversification of surviving mammals, birds, frogs, and teleost fishes. The evolution of snakes, a major clade of predators, following the K-Pg extinction event remains poorly understood, highlighting the importance of this mass extinction in shaping Earth's extant vertebrate faunas.
NATURE COMMUNICATIONS
(2021)
Article
Geology
Keith Berry
Summary: In this study, evidence is presented to show that the faulting at Madrid East and neighboring localities occurred after the K/Pg boundary.
CRETACEOUS RESEARCH
(2024)
Article
Geology
Carolina Acosta Hospitaleche, Jose P. OGorman, Karen M. Panzeri
Summary: A fossil of a left ulna found in the southeastern margin of the Somun Cura Plateau, Chubut Province (Argentina) is suggested to belong to a possible new species of neornithine bird. This could be the first report of a neornithine bird from the La Colonia Formation if correctly identified.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Gerardo Alvarez Herrera, Federico Agnolin, Sebastian Rozadilla, Gaston E. Lo Coco, Makoto Manabe, Takanobu Tsuihiji, Fernando E. Novas
Summary: In this study, researchers describe a new enantiornithine bird fossil, Yatenavis ieujensis, which represents one of the youngest occurrences of this group in the Upper Cretaceous. The specimen, a distal half of a right humerus, was discovered in southern Santa Cruz Province, Argentina, and is the southernmost enantiornithine fossil found to date. Yatenavis possesses unique characteristics, some of which are shared with an unnamed enantiornithine from another fossil site in Patagonia.
CRETACEOUS RESEARCH
(2023)
Article
Multidisciplinary Sciences
Raphael Morard, Christiane Hassenruck, Mattia Greco, Antonio Fernandez-Guerra, Sylvain Rigaud, Christophe J. Douady, Michal Kucera
Summary: Planktonic foraminifera are important for understanding ancient climate and the evolution of plankton. The origins of these organisms are unclear, but a molecular clock suggests that benthic foraminifera dispersed in the plankton and renewed the diversity of planktonic foraminifera after a mass extinction event. This study shows that calcareous benthic foraminifera are able to actively disperse in the plankton and that modern planktonic clades originated from different benthic ancestors. These findings challenge the classical interpretation of the fossil record and suggest that the diversity of planktonic foraminifera is continuously fueled by benthic foraminifera.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Thodoris Argyriou, Donald Davesne
Summary: The study in Greece revealed valuable fossil records of marine ray-finned fishes from the Cretaceous-Paleogene interval, shedding light on the characteristics of marine ecosystems during that time. Late Cretaceous actinopterygians were dominated by Aulopiformes, while the Paleocene fossils included various fish species. The research expanded our understanding of the fossil record from this critical time period and provided insights into the depauperate state of Tethyan ichthyofaunas following the extinction event.
Article
Evolutionary Biology
Christian Salazar, Wolfgang Stinnesbeck
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2016)
Article
Geology
Eberhard Frey, Eric W. A. Mulder, Wolfgang Stinnesbeck, Christian Salazar, Luis Arturo Hector Quinzio-Sinn
CRETACEOUS RESEARCH
(2016)
Article
Geology
Huber A. Rivera, Jacobus P. Le Roux, L. Katherine Sanchez, Jorge E. Marino-Martinez, Christian Salazar, J. Carolina Barragan
SEDIMENTARY GEOLOGY
(2018)
Article
Geology
Sven N. Nielsen, Christian Salazar
CRETACEOUS RESEARCH
(2011)
Article
Geosciences, Multidisciplinary
Wolfgang Stinnesbeck, Eberhard Frey, Luis Rivas, Judith Pardo Perez, Marcelo Leppe, Christian Salazar Soto, Patricio Zambrano Lobos
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2014)
Article
Paleontology
Rodrigo A. Otero, Sergio Soto-Acuna, Frank Robin O'Keefe, Jose P. O'Gorman, Wolfgang Stinnesbeck, Mario E. Suarez, David Rubilar-Rogers, Christian Salazar, Luis Arturo Quinzio-Sinn
JOURNAL OF VERTEBRATE PALEONTOLOGY
(2014)
Article
Paleontology
Christian Salazar, Wolfgang Stinnesbeck, Luis Arturo Quinzio-Sinn
NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN
(2010)
Article
Geology
Christian Salazar, Wolfgang Stinnesbeck, Miguel Alvarez
CRETACEOUS RESEARCH
(2020)
Correction
Geology
Christian Salazar, Wolfgang Stinnesbeck, Miguel Alvarez
CRETACEOUS RESEARCH
(2020)
Article
Geography, Physical
Rafael Labarca, Erwin Gonzalez-Guarda, Alvaro Lizama-Catalan, Natalia A. Villavicencio, Jhonatan Alarcon-Munoz, Felipe Suazo-Lara, Pablo Oyanadel-Urbina, Paula Soto-Huenchuman, Christian Salazar, Sergio Soto-Acuna, Karina E. Buldrini
QUATERNARY SCIENCE REVIEWS
(2020)
Article
Geosciences, Multidisciplinary
Hermann Rivas, Christian Salazar, Wolfgang Stinnesbeck
Summary: The study focuses on the Toqui Formation in the Ayse'n-Rio Mayo Basin in central Patagonia, revealing 23 lithofacies and highlighting the complex evolution of its depositional environments.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geology
Hermann Rivas, Christian Salazar, Wolfgang Stinnesbeck
Summary: This study describes the lithofacies and microfacies of the Aysen-Rio Mayo Basin and reveals a cool-water environment. The sedimentary rocks in this basin consist mainly of mixed rocks with bioclasts and volcaniclastic debris, indicating a wave-influenced mixed ramp environment.