Article
Geosciences, Multidisciplinary
Sherif M. El Baz, Hamdalla A. Wanas, Heba Allah Abou Awad, Ehab M. Assal
Summary: The present study focuses on the late Middle Eocene-early Late Eocene ostracods from two successions in Egypt. The recorded ostracod assemblage contains 33 species belonging to 20 genera and 9 families. Three local biozones are recognized based on their stratigraphic ranges. Three distinctive provinces are identified through multivariate analyses, suggesting ostracod migration along the southern Tethys during the Eocene age.
GEOLOGICAL JOURNAL
(2022)
Article
Geochemistry & Geophysics
Rui Zhang, Vadim A. Kravchinsky, Jie Qin, Avto Goguitchaichvili, Jianxing Li
Summary: The study indicates that in the middle Eocene, aridification in the Altun Shan is associated with a cooling event in the global oxygen isotope record, a sea surface temperature record on the east Tasmanian plateau, and an aridity record in the surrounding sedimentary basins of Central Asia.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Shuchen Jin, Xinxin Sun, Xianqing Jing, Zijian Zhang, Xiang Zhang, Zhenyu Yang
Summary: This study presents new paleomagnetic data from the Zongpu Formation Member I in Tingri, indicating that the Tethyan Himalaya was located at 3.9 +/- 2.6 degrees S during 62-59 Ma. The findings challenge the prevailing hypothesis of the initial collision between India and Asia during this period, suggesting that Greater India and the Tethyan Himalaya were still connected, leaving a Neo-Tethys Ocean of approximately 2,000 km. The drift rate of the India plate further suggests that the northern margin of Greater India collided with Asia at around 50 Ma, closing the Neo-Tethys Ocean.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Multidisciplinary Sciences
Robin van der Ploeg, Margot J. Cramwinckel, Ilja J. Kocken, Thomas J. Leutert, Steven M. Bohaty, Chris D. Fokkema, Pincelli M. Hull, A. Nele Meckler, Jack J. Middelburg, Inigo A. Muller, Donald E. Penman, Francien Peterse, Gert-Jan Reichart, Philip F. Sexton, Maximilian Vahlenkamp, David De Vleeschouwer, Paul A. Wilson, Martin Ziegler, Appy Sluijs
Summary: The Middle Eocene Climatic Optimum (MECO) experienced a transient warming of 3 degrees Celsius, leading to increased salinity in the North Atlantic subtropical gyre and potentially a poleward expansion of its northern boundary.
Article
Multidisciplinary Sciences
Yi-Ching Yeh, Jing-Yi Lin, Shu-Kun Hsu, Ching-Hui Tsai, Ching-Min Chang
Summary: The study reveals the geological evolution of the West Philippine Basin, including magmatic events, amagmatic events, related volcanic activities, and the importance of the Great Benham Rise in the region. The results indicate that the Great Benham Rise plays a key role in the spreading history of the basin.
SCIENTIFIC REPORTS
(2021)
Article
Biology
Ashley W. Poust, Paul Z. Barrett, Susumu Tomiya
Summary: A new saber-toothed mammalian carnivore, Pangurban egiae, with strongly derived hypercarnivorous features, has been discovered in southern California. This finding provides clear evidence for the rapid radiation and spread of nimravid carnivores across Asia and North America, as well as the timing of early divergences within the family. It also highlights the swift diversification of hypercarnivorous nimravids during a period of global climatic instability.
Article
Multidisciplinary Sciences
Jose Carlos Brito, Andack Saad Sow, Candida Gomes Vale, Cristian Pizzigalli, Dieng Hamidou, Duarte Vasconcelos Goncalves, Fernando Martinez-Freiria, Frederico Santarem, Hugo Rebelo, Joao Carlos Campos, Juan Manuel Pleguezuelos, Maria Joana Ferreira da Silva, Marisa Naia, Pedro Tarroso, Raquel Godinho, Teresa Luisa Silva, Tiago Macedo, Zbyszek Boratynski, Zeine El Abidine Sidatt, Francisco Alvares
Summary: Detailed knowledge about biodiversity distribution is critical for monitoring the biological effects of global change processes. However, biodiversity knowledge gaps, especially in the desert biome, hinder the monitoring of conservation trends. The study assessed the diversity, distribution, and conservation of land mammals in Mauritania. Results showed concentrations of mammal species richness in coastal areas, along the Senegal River valley, and in mountain plateaus. The current work serves as a baseline for future research on threatened mammals and highlights the need for collaborative action to ensure the long-term conservation of land mammals in Mauritania.
Article
Geosciences, Multidisciplinary
Sherif M. El Baz, Hamdalla A. Wanas, Heba Allah Abou Awad, Ehab M. Assal
Summary: This study investigates the benthic foraminiferal assemblage from the Um Rigl succession in the northwest of Fayoum area, Egypt. Two rock units, the Gehannam Formation and Birket Qarun Formation, are recognized stratigraphically. A total of 63 species are identified and analyzed to establish a benthic foraminiferal biozone and two ecozones.
JOURNAL OF AFRICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Suneel Kumar Joshi, Sudhir Kumar, Rajiv Sinha, Shive Prakash Rai, Suhas Khobragade, M. Someshwar Rao
Summary: The isotopic composition of precipitation, specifically d(18)O and d(2)H, is often used to trace moisture sources. In northwest India, these values correlate with air temperature, but the sources of water vapor are unclear. This study collected daily precipitation isotope data in 2013 and established regional and local meteoric water lines. The results showed spatial and temporal variability in the isotopic composition of precipitation, with different moisture sources identified for different seasons. The study also suggested the occurrence of local moisture recycling.
GEOLOGICAL JOURNAL
(2023)
Article
Environmental Sciences
Mohammed Khairy, Emily Brault, Rebecca Dickhut, Karin C. Harding, Tero Harkonen, Olle Karlsson, Kristine Lehnert, Jonas Teilmann, Rainer Lohmann
Summary: The concentration of persistent organic pollutants (POPs) in Antarctic marine mammals is influenced by species, age, and sex, demonstrating a complex pattern of bioaccumulation. Killer whales generally have higher POPs concentrations compared to seals, while adult male crabeater and Weddell seals, as well as adult female Ross seals, show consistently higher levels of PCBs and PBDEs.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Asmaa E. Korin, Hatem F. Hassan
Summary: The study used ostracods associations and sedimentological data to define the paleoecology and paleobiogeography of the Middle-Late Eocene rock units in the North Eastern Desert of Egypt. Three ostracod biozones were identified, reflecting paleoenvironments in the study area. The ostracod assemblage showed similarities with bioprovinces in the Middle East and North and East Africa.
GEOLOGICAL JOURNAL
(2022)
Article
Multidisciplinary Sciences
Haibing Wang, Yuanqing Wang
Summary: This study reports a well-preserved detached middle ear structure in a eutherian mammal from the Early Cretaceous Jehol Biota, suggesting an independent evolution of hearing and chewing apparatuses in early eutherians.
NATURE COMMUNICATIONS
(2023)
Article
Plant Sciences
Alexei B. Herman, Tatiana M. Kodrul, Alexei Perelygin
Summary: In this study, a securely dated middle Eocene plant fossil assemblage from the Bering Island is described, including conifers and dicotyledonous angiosperms. The flora is most similar to the late Eocene flora of Western Kamchatka, suggesting a middle to late Eocene age for the Kamchatkan flora with coniferous-broadleaved deciduous vegetation existed in a wet temperate climate of northeast Asia.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2022)
Article
Geochemistry & Geophysics
Edoardo Dallanave, Rupert Sutherland, Gerald R. Dickens, Liao Chang, Evdokia Tema, Laia Alegret, Claudia Agnini, Thomas Westerhold, Cherry Newsam, Adriane R. Lam, Wanda Stratford, Julien Collot, Samuel Etienne, Tilo von Dobeneck
Summary: New information from paleomagnetic data helps determine the past trajectory and absolute paleolatitude of northern Zealandia from the middle Eocene to the early Miocene. The findings suggest that northern Zealandia migrated 6 degrees northward between the early Oligocene and early Miocene, with lower absolute paleolatitudes at certain periods, possibly due to true polar wander.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Cesare A. Papazzoni, Barbara Cavalazzi, Maria Franca Brigatti, Sorin Filipescu, Frederic Foucher, Luca Medici, Frances Westall, Annalisa Ferretti
Summary: The middle Eocene ironstone of the Transylvanian Basin in Romania provides new insights into the genesis and paleoenvironmental significance of ferruginous ooids. Through an integrated analysis using Environmental Scanning Electron Microscopy, Micro-X-ray Diffraction, and Raman spectroscopy, the ooids were chemically and mineralogically characterized. The presence of large foraminifera within a matrix dominated by millimetric Fe-ooids suggests the existence of ferruginous bottom waters in the Eocene tropical/sub-tropical shallow-marine settings. The limited iron source area indicates that local events could trigger iron ooidal deposition throughout the Phanerozoic.