Article
Geosciences, Multidisciplinary
Xin Jin, Yixing Du, Angela Bertinelli, Zhiqiang Shi, Nereo Preto, Hao Zou, James G. Ogg, Lu Han, Qiangwang Wu, Manuel Rigo
Summary: The study focused on the biostratigraphy and carbon stable isotopes of the Norian Stage in the eastern Tethys region, specifically in the HYB section of the Baoshan terrane in SW China. The biostratigraphy identified the Alaunian-Sevatian substage boundary at meter 23 of the HYB section. While the carbon isotopes of carbonate carbon and oxygen may have been influenced by diagenesis, the carbon isotopes of organic matter showed multiple excursions across the Alaunian-Sevatian boundary, possibly related to volcanic activities during the Angayucham flood basalts emplacement.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geography, Physical
Cornelia Rasmussen, Randall B. Irmis, Roland Mundil, Morgan F. Schaller, John Geissman, William G. Parker, Christopher J. Lepre, Paul E. Olsen
Summary: This study examines the Upper Triassic Chinle Formation in Petrified Forest National Park, Arizona, using data from the Colorado Plateau Coring Project. The research suggests a possible correlation between the Manicouagan impact event and the Adamanian-Revueltian biotic turnover event, but establishing a causal relationship between the two remains challenging. Additionally, the study finds that the climate became drier, which may have contributed to the biotic turnover event.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Paleontology
William G. Parker, Sterling J. Nesbitt, Adam D. Marsh, Ben T. Kligman, Kenneth Bader
Summary: Doswellia kaltenbachi is a long-snouted non-archosaur archosauriform from the Late Triassic of the United States, with new material discovered in Arizona for the first time. The findings strengthen the presence of this taxon during the Adamanian period and establish biogeographic links to other regions like Texas and Virginia, highlighting the similarity of North American vertebrate assemblages across different time periods.
JOURNAL OF VERTEBRATE PALEONTOLOGY
(2021)
Article
Geology
Silvio Renesto, Fabio Magnani, Rudolf Stockar
Summary: A new species of the actinopterygian fish genus Saurichthys is described, found in the UNESCO World Heritage area of Monte San Giorgio. This new species shows unique characteristics in its fins and is closely related to the Saurorhynchus species group. The discovery contributes to our understanding of the plasticity and functional adaptations of the successful genus Saurichthys during the Triassic period.
RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA
(2021)
Article
Paleontology
Imanol Yanez, Diego Pol, Juan Martin Leardi, Oscar A. Alcober, Ricardo N. Martinez
Summary: This study introduces a new Late Triassic archosaur, Incertovenator longicollum, with unique character states placing it within early avemetatarsalian and pseudosuchian archosaur clades. Through phylogenetic analyses, it is identified as either an early diverging avemetatarsalian or a loricatan closely related to Mandasuchus tanyauchen.
ACTA PALAEONTOLOGICA POLONICA
(2021)
Article
Geochemistry & Geophysics
Honami Sato, Akira Ishikawa, Tetsuji Onoue, Yuki Tomimatsu, Manuel Rigo
Summary: Through analyzing stratigraphic variations, this study suggests that the Rochechouart impact event may have occurred before the Norian and Rhaetian boundary, leading to changes in the environment and biota.
Article
Geography, Physical
Zeyang Liu, Lawrence M. E. Percival, Delphine Vandeputte, David Selby, Philippe Claeys, D. Jeffrey Over, Yue Gao
Summary: The Frasnian-Famennian biotic crisis, similar to 372 million years ago, was associated with dramatic climate and ocean disturbances, possibly triggered by large-scale volcanic activity. However, not all sections show mercury enrichment above the boundary, questioning the timing and geographic distribution of the volcanism responsible for the mass extinction event.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Biology
Susannah C. R. Maidment, Christopher D. Dean, Robert I. Mansergh, Richard J. Butler
Summary: Researchers found that while the raw data on ceratopsid and hadrosaurid dinosaurs strongly supported faunal provinciality, this result was primarily driven by sampling bias, and the data quality is currently inadequate for fair tests. Future studies should focus on smaller scale, higher resolution case studies to better control sampling bias.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2021)
Article
Paleontology
Torsten M. Scheyer, Urs Oberli, Nicole Klein, Heinz Furrer
Summary: Researchers have discovered an incomplete rib specimen in the Alpine region, which is believed to belong to the small clade of marine reptiles known as the Saurosphargidae. Previously, this clade was only known to exist during the Anisian stage of the Middle Triassic, but this new find extends their occurrence by approximately 35 million years into the Late Triassic.
SWISS JOURNAL OF PALAEONTOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Michael J. Orchard
Summary: The Upper Triassic conodont genus Primatella is significant for identifying the Carnian-Norian stage boundary in the Panthalassan and Tethyan regions. The occurrence and distribution of two key species, P. asymmetrica and P. bifida, in various regions, including North American Cordillera, Great Basin, western Tethys, and Timor-Leste, are documented. However, the differing nomenclature in Tethyan regions has complicated the correlation potential of Primatella species, thereby impacting their stratigraphic utility.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Makram Hedhli, William A. Matthews, Thomas Hadlari, Daniel Alonso-Torres, Stephen Edward Grasby, Benoit Beauchamp
Summary: This study uses detrital zircon U-Pb geochronological data from Alberta, Montana, and Nevada to understand the sediment dispersion patterns during the Late Devonian-Early Carboniferous Antler orogeny. The results show that the Western Laurentia basins were locally sourced from different tectonic fragments and were dominated by recycled older strata. The presence of near-depositional ages and similarities with western strata indicate a westerly sediment sourcing. The findings suggest that the Antler orogeny triggered a shift in sediment deposition and marked the demise of the Paleozoic passive margin.
Article
Geology
V Elongo, H. Falck, K. L. Rasmussen, L. J. Robbins, R. A. Creaser, Y. Luo, D. G. Pearson, C. Sarkar, E. Adlakha, M. C. Palmer, J. M. Scott, K. Hickey, K. Konhauser, P. Lecumberri-Sanchez
Summary: The highly irregular and localized distribution of tungsten deposits worldwide poses a supply challenge for key industries. This study investigates the factors controlling tungsten distribution and finds that tungsten is specifically associated with crustal materials derived from the mantle during specific geological periods. Weathering and erosion processes of supercontinents favored the pre-enrichment of tungsten in sediments, and orogenic heating produced reduced melts that efficiently scavenged tungsten and formed the largest deposits in North America.
Article
Geography, Physical
Josephina Hartung, Felix J. Augustin, Panagiotis Kampouridis, Daniel J. Chure
Summary: This study describes a new trace fossil assemblage from the Upper Triassic Chinle Formation in the southwest USA, revealing support for rheotaxis behavior in notostracan crustaceans and indicating they lived in an environment dominated by sheet-flow events in ephemeral river systems.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Environmental Sciences
Valerio Lucarini, Vera Melinda Galfi, Jacopo Riboldi, Gabriele Messori
Summary: Understanding the statistical properties of extreme weather events and their underlying physical processes is crucial for evaluating climate variability, climate change, and associated hazards. Recent studies have shown that large deviation theory (LDT) is useful for investigating persistent extreme events and estimating long return periods. In this study, we utilize LDT and a state-of-the-art Earth system model to analyze the 2021 Western North America summer heatwave. We find that the occurrence of the heatwave can be attributed to climate variability, but its probability is greatly amplified by ongoing climate change. We also examine the spatial coherence and the role of the Rocky Mountains in influencing extreme events in the Western Pacific region of North America.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Landon Burgener, Ethan Hyland, Emily Griffith, Helena Mitasova, Lindsay E. Zanno, Terry A. Gates
Summary: The study reveals the presence of a distinct climate barrier in the Western Interior Basin during the final 15 million years of the Cretaceous, dividing the region into warm southern and cool northern biomes. This climate barrier significantly influenced the distribution of primary producers and the entire trophic system across western North America.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
