Article
Paleontology
Claudia Herrera, Graciela Esteban, Daniel A. Garcia-Lopez, Virginia Deraco, Judith Babot, Cecilia Del Papa, Sara Bertelli, Norberto Giannini
Summary: The study describes isolated remains of a Paleogene cingulate found in the northwestern Argentina, representing the oldest record of Euphractinae in the region and emphasizing the endemic nature of its Paleogene faunas.
REVISTA BRASILEIRA DE PALEONTOLOGIA
(2021)
Article
Geosciences, Multidisciplinary
Daniel Barasoain, Laureano R. Gonzalez Ruiz, Diego Brandoni
Summary: New remains of Dasypodidae have been discovered in the Neogene Salicas Formation in La Rioja Province, Argentina, indicating a Late Miocene age and adding to the diversity of this formation. The association of dasypodids suggests affinities with Late Miocene localities in northwestern Argentina, with some species being endemic to the region. These differences may be related to tectonic and paleoenvironmental factors.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2022)
Article
Paleontology
Diego Brandoni, Daniel Barasoain, Laureano R. GONZaLEZ Ruiz
Summary: This paper describes fossil remains of different species of Dasypodidae from the Toro Negro Formation in Argentina. These fossils include species that have not been previously recorded in this formation, suggesting an increase in mammal diversity. These findings also support the proposed ages for the lower Member of the Toro Negro Formation as Late Miocene-Early Pliocene.
COMPTES RENDUS PALEVOL
(2023)
Article
Geosciences, Multidisciplinary
Yu Han, Yingchang Cao, Chao Liang, Keyu Liu, Fang Hao
Summary: A paleoclimate reconstruction based on high-resolution records from lacustrine shale in the Bohai Bay Basin reveals a shift in orbital variability and a humidification event at -41.9 Ma in East Asia. The intensification of the East Asian monsoons at this time was likely a response to the elevated atmospheric pCO2 during the concurrent global warming.
Article
Geology
Manuel Martin-Martin, Francesco Guerrera, Josep Tosquella, Mario Tramontana
Summary: The study of the middle Eocene platforms in the westernmost Tethys reveals a progressive marine ramp and oligotrophic conditions, with a dominant presence of larger benthic foraminifera and absence of z-corals. These features are explained by specific paleogeographic factors in the region connected to the Atlantic Ocean.
SEDIMENTARY GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Alexander J. J. Krause, Appy Sluijs, Robin van der Ploeg, Timothy M. Lenton, Philip A. E. Pogge von Strandmann
Summary: The Middle Eocene Climatic Optimum was a 400,000-year-long global warming phase with increased CO2 concentrations and deep-ocean acidification. The prolonged duration contradicts the expected negative feedback from temperature-dependent silicate weathering. By measuring lithium isotope ratios, researchers found a positive excursion indicating a shift from congruent to incongruent weathering. Continental volcanism and clay formation played crucial roles in initiating and sustaining the warming event, suggesting the importance of clay mineral dynamics in the carbon cycle for intermediate timescales.
Article
Geography, Physical
M. Sol Raigemborn, Sabrina Lizzoli, Ethan Hyland, Jennifer Cotton, Lucia E. Gomez Peral, Elisa Beilinson, J. Marcelo Krause
Summary: This study is of significant importance for understanding climatic changes in the Southern Hemisphere during the Eocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Jihede Haj Messaoud, Nicolas Thibault, Brahimsamba Bomou, Thierry Adatte, Johannes Monkenbusch, Jorge E. Spangenberg, Mohammed H. Aljahdali, Chokri Yaich
Summary: Calcareous nannofossil biostratigraphy and carbon-isotope stratigraphy of the middle-upper Eocene Souar Formation in Tunisia provide a refined stratigraphy of the southwestern Neo-Tethys margin. The study suggests a correlation between different records in Tunisia, leading to the establishment of a synthetic stratigraphic chart. Bayesian statistics were used to build an age-depth model, indicating a hiatus in the Lutetian and a response to increased productivity in the late Lutetian and early Bartonian.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Plant Sciences
Mirta Elena Quattrocchio
Summary: This study documents the biostratigraphy of dinoflagellate cysts from the La Barca Formation at the Punta Ainol Locality in Tierra del Fuego Province, Argentina, representing a new record for the Paleogene in southern South America. Some significant events are in agreement with nannofossil data, and three Paleocene/Eocene dinoflagellate cyst zones are recognized in this study.
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
Plant Sciences
Sol Noetinger, Ines Aramendia, Roberto R. Pujana, Juan L. Garcia Massini, Viviana D. Barreda
Summary: This study estimates the age, paleoenvironment, and climatic conditions of the La Marcelina Formation in Southern Patagonia based on the analysis of terrestrially derived spores, algae cysts, and pollen grains. The findings suggest that the flora in this region during the Eocene consisted of a mixture of Gondwanan and Neotropical elements, dominated by Podocarpaceae, Nothofagaceae, and Proteaceae, and likely developed in a temperate and humid climate.
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
(2023)
Article
Geosciences, Multidisciplinary
Xiuyan Liu, Alexandre Tarantola, Honghan Chen, Yahao Huang, Zhongrui Wu, Junjia Fan, Majid Safaei-Farouji, Mehdi Ostadhassan
Summary: By measuring fluid inclusions in halite samples from the Qianjiang Formation in the Jianghan Basin, it was found that the temperature fluctuations in the middle Eocene were similar to those in Death Valley, indicating the presence of a monsoon climate during that time.
MARINE AND PETROLEUM GEOLOGY
(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
Parasitology
Melisa E. Morales, Fiorella Campo Verde Arbocco, Catalina Munoz-San Martin, Agustin M. Abba, Tatiana A. Rios, Guillermo H. Cassini, Pedro E. Cattan, Graciela A. Jahn, Mariella Superina
Summary: This study assessed the Trypanosoma cruzi infection and parasite load in Zaedyus pichiy armadillos from different regions of Mendoza Province, Argentina. The results showed a high prevalence (76%) and a wide range of parasite loads in the analyzed samples. The infection rates and parasite loads were influenced by hibernation and climatic factors.
PARASITOLOGY RESEARCH
(2023)
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)
