Article
Biology
Ezequiel I. Vera, Mateo D. Monferran, Julieta Massaferro, Lara M. Sabater, Oscar F. Gallego, Valeria S. Perez Loinaze, Damian Moyano-Paz, Federico L. Agnolin, Makoto Manabe, Takanobu Tsuhiji, Fernando E. Novas
Summary: This study presents an insect assemblage from the Maastrichtian Chorrillo Formation in southern Argentina, filling the gap in knowledge regarding insect assemblages in the Campanian-Maastrichtian interval in the Southern Hemisphere. The identified clades suggest that the insect assemblage of the Maastrichtian resembled those of Cenozoic age, indicating an evolutionary process between the Early Cretaceous and Paleogene.
COMMUNICATIONS BIOLOGY
(2023)
Article
Geology
F. Suazo Lara, R. O. Gomez
Summary: Frogs have been important since the Cretaceous period, but their incomplete fossils and challenging identification have marginalized them in research. Recent studies in Chilean and Argentinean Patagonia reveal the identities of frogs from three geological periods, providing valuable information on Cretaceous frogs.
CRETACEOUS RESEARCH
(2022)
Article
Paleontology
Nickolas A. Brand, Andrew B. Heckert, Israel Sanchez, John R. Foster, Rebecca K. Hunt-Foster, Jaelyn J. Eberle
Summary: We describe a microvertebrate assemblage from the J&M site, consisting of new taxa of sharks, rays, osteichthyans, and land animals. The discovery of marine-associated taxa suggests the influence of marine or estuarine environments at the J&M site. The presence of mammalian taxa suggests a Judithian-Lancian age for the site.
ACTA PALAEONTOLOGICA POLONICA
(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
Soledad S. Brezina, Paul D. Taylor, Maria Romero, Evangelina E. Palopolo, Silvio Casadio
Summary: This study describes the diverse bryozoan fauna encrusting oyster shells from the Maastrichtian and Danian Jaguel and Roca formations in the Neuquen Basin, recording multiple species and introducing two new ones. Results indicate that the diversity of encrusting bryozoans associated with oyster shells shows no major changes across the K/Pg boundary in northern Patagonia. However, an important increase in diversity is recorded during the upper Danian.
CRETACEOUS RESEARCH
(2021)
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
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
Pablo M. Villegas, A. Martin Umazano, Marcelo Krause, Mariana Brea
Summary: Conifer fossil woods from the Campanian Puntudo Chico Formation were studied, confirming the presence of Brachyoxylon currumillii and the introduction of Cupressinoxylon sp. cf. C. artabeae in the formation. The new specimens of Podocarpoxylon mazzonii suggest that this taxon is common in the Cretaceous to Eocene floristic assemblages. The growth-ring analysis of these fossil trees indicates their development under temperate and humid conditions, with slight sensitivity from year to year and a terminal event representing a cessation or retardation of cambial activity. Other paleoclimatic proxies suggest a temperate-warm and humid depositional environment with some semi-arid events in the Puntudo Chico Formation.
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
Geology
Enelise Katia Piovesan, Osvaldo Jose Correia Filho, Robbyson Mendes Melo, Luiz Drude Lacerda, Rodolfo Otavio Dos Santos, Allysson Pontes Pinheiro, Fabiana Rodrigues Costa, Juliana Manso Sayao, Alexander Wilhelm Armin Kellner
Summary: A biostratigraphic and paleoenvironmental analysis was conducted on the Campanian-Maastrichtian deposits on The Naze, Antarctica, based on foraminiferal assemblages, lithofacies analysis, and Hg/TOC data. The study revealed a sedimentary association of lithofacies and an inference of the age of the interval to be from the Early Campanian to the Late Maastrichtian. The absence of Hg-TOC unassociated excursions suggested regional oceanic processes as the major environmental change driver.
CRETACEOUS RESEARCH
(2021)
Article
Geology
Luis-Andres Guerrero-Murcia, Javier Helenes, Mercedes di Pasquo, James Martin
Summary: This study presents the results of a quantitative and qualitative analysis of dinoflagellate cysts in outcrop samples from the Snow Hill Island Formation in James Ross Island, Antarctica. The assemblages of dinoflagellate cysts were abundant and mainly composed of gonyaulacoid taxa. Based on the presence and absence of certain species, the age of the lower and upper strata was estimated to be late Campanian and early Maastrichtian, respectively.
CRETACEOUS RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Muhammad Omar Ragab, Mohamed El Amin Ahmed Bassiouni, Mohamed Boukhary, Walid Ahmed Makled, Tarek Fouad Mostafa
Summary: The Campanian-Maastrichtian organic-rich rocks in the Quseir - Safaga Region in the Eastern Desert of Egypt have growing economic importance. This study investigates the nature of the organic matter and the paleoenvironmental settings in the Duwi and Dakhla formations using palynofacies and organic petrography. The results reveal the presence of high productivity amorphous organic matter and immature kerogen, highlighting the potential for shale oil extraction.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geology
Leslie M. E. Manriquez, Ernesto L. Lavina, Renata Guimaraes Netto, Rodrigo Scalise Horodyski, Marcelo Leppe
Summary: Studies on the environmental dynamics of high energy beach systems involve analyzing sedimentary structures, flow directions, and fossil characteristics to reveal the evolution of the system and its associated parameters. The results demonstrate the complexity of the system influenced by multiple factors, showing varied characteristics.
SEDIMENTARY GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Orabi H. Orabi, Ahmed M. Eldosouky, Kamal Abdelrahman, Reda El M. Gammal, Malarkodi Nallamuthu, Mohammed S. Fnais, Peter Andras
Summary: Sea-level fluctuation occurred during the Late Campanian, characterized by two chert bands and conglomeratic phosphate beds. A global warming event resulted in a transgression phase marked by the presence of Globotruncana aegyptiaca Nakkady foraminifera. The relative abundance of Gublerina rajagopalani Govindan and Planoheterohelix planata (Cushman) increased during the CF6/CF5 zones, indicating their ability to thrive in high-stress environments. The CF4 records show a decrease in planktic/benthic ratio and the presence of dark grey shales, suggesting a fall in sea level and low oxygen conditions. The CF3-CF1 zones are characterized by the bloom of heterohelicids and a decrease in diversity before the K/Pg boundary event.
Editorial Material
Paleontology
Evangelos Vlachos, Juliana Sterli, Marcelo Saul De La Fuente
Correction
Multidisciplinary Sciences
Ariana Paulina-Carabajal, Juliana Sterli, Johannes Mueller, Andre Hilger
Article
Paleontology
Juliana Sterli, Marcelo S. de la Fuente
JOURNAL OF PALEONTOLOGY
(2019)
Article
Geosciences, Multidisciplinary
Oliver A. Lopez-Conde, Juliana Sterli, Jesus Alvarado-Ortega, Maria L. Chavarria-Arellano, Hector Porras-Muzquiz
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2019)
Article
Zoology
J. Alfredo Holley, Juliana Sterli, Nestor G. Basso
CONTRIBUTIONS TO ZOOLOGY
(2020)
Article
Geology
Carolina Oriozabala, Juliana Sterli, Marcelo S. de la Fuente
CRETACEOUS RESEARCH
(2020)
Article
Geosciences, Multidisciplinary
J. Marcelo Krause, Jahandar Ramezani, Aldo M. Umazano, Diego Pol, Jose L. Carballido, Juliana Sterli, Pablo Puerta, N. Ruben Cuneo, Eduardo S. Bellosi
Article
Geosciences, Multidisciplinary
Marcelo S. de la Fuente, Juliana Sterli, Veronica Krapovickas
Summary: The Triassic period is crucial for turtle evolution due to the oldest turtle fossils and tracks being found from this time. The records from Northern and Southern Pangea provide valuable information on the early stages of turtle evolution. New discoveries in South America and Europe, as well as discussions on the turtle shell's origin, offer fresh perspectives on the subject.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(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)
Editorial Material
Anatomy & Morphology
Juliana Sterli, Evangelos Vlachos
Summary: The Turtle Evolution Symposium, held in 2021, brought together scientists from 25 countries who presented their latest research on turtle evolution. This Special Volume of The Anatomical Record features some of the advancements discussed during the symposium.
ANATOMICAL RECORD-ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY
(2023)
Article
Paleontology
Juliana Sterli, Ricardo N. Martinez, Ignacio A. Cerda, Cecilia Apaldetti
Summary: This study presents a new species of turtle from the Late Triassic of Argentina, with unexpected internal cavities in the peripheral plates. These findings suggest deep homology in the periphery of turtle shells and a more plastic and variable structure in the earliest stages of turtle evolution.
PAPERS IN PALAEONTOLOGY
(2021)
Article
Paleontology
Ariana Paulina-Carabajal, Juliana Sterli, Ingmar Werneburg
ACTA PALAEONTOLOGICA POLONICA
(2019)
Article
Paleontology
Evangelos Vlachos, Juliana Sterli, Katerina Vasileiadou, George Syrides
PAPERS IN PALAEONTOLOGY
(2019)
Article
Paleontology
Juliana Sterli, Marcelo S. De La Fuente, Guillermo W. Rougier
JOURNAL OF VERTEBRATE PALEONTOLOGY
(2018)
Article
Paleontology
Ignacio J. Maniel, Marcelo S. de la Fuente, Juliana Sterli, Juan M. Jannello, J. Marcelo Krause
PAPERS IN PALAEONTOLOGY
(2018)