Article
Geology
Paulo M. Brito, David M. Martill, Ian Eaves, Roy E. Smith, Samuel L. A. Cooper
Summary: An isolated, crushed ossified lung fossil of a mawsoniid coelacanth was reported from the uppermost Cretaceous of Oued Zem, Morocco. This specimen represents the last record of a coelacanth before their pseudo-extinction at the end of the Mesozoic, and it is also the first record of a marine coelacanth in the Mesozoic of Morocco. The large size of the lung suggests a fish estimated at between 3.65 m and 5.52 m total body length.
CRETACEOUS RESEARCH
(2021)
Article
Energy & Fuels
Tim A. Moore, Shifeng Dai, Carme Huguet, Jillian Pearse, Jingjing Liu, Joan S. Esterle, Rongkun Jia
Summary: This study conducted petrographic, geochemical, and carbon isotopic determinations on coal samples from the Late Cretaceous-Paleocene Guaduas Formation in Colombia. The results revealed the characteristics and influences of the depositional environment and climate on the formation.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
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
Multidisciplinary Sciences
Ariana Paulina-Carabajal, Francisco T. Barrios, Ariel H. Mendez, Ignacio A. Cerda, Yuong-Nam Lee
Summary: Recent discoveries in southern South America have improved the Late Cretaceous dinosaur record, with findings from Chorrillo and Cerro Fortaleza formations adding ankylosaur remains to the previously recorded dinosaur fauna. A site in Cerro Fortaleza Formation yielded isolated teeth and osteoderms from Abelisauridae, Titanosauria, Nodosauridae, and Peirosauridae, providing valuable information on the biodiversity of the region during the Campanian-Maastrichtian age. This site also marks the first record of ankylosaurs and the most southerly record of Peirosauridae in South America.
Article
Geosciences, Multidisciplinary
Juan Carvajal-Torres, Octavian Catuneanu, Andres Mora, Victor Caballero, Martin Reyes
Summary: This study reveals the geological evolution of the present-day Magdalena Valley, Eastern Cordillera, and Llanos Basin. It shows that these areas were part of a regional multiphase basin that went through extensional basin, retroarc foreland basin, and separation into a hinterland and a foreland basin stages.
FRONTIERS IN EARTH SCIENCE
(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
Geology
Katrina Mayo, Ricardo L. Silva, Paul R. Durkin
Summary: This study refines the paleoenvironmental reconstructions of Late Cretaceous rivers through facies and facies associations analysis, meander-belt architecture characterization, and paleohydraulic parameter calculations. The results demonstrate that the meander-belt deposits of the Dinosaur Park Formation were deposited in a fluvial environment upstream of the fluvial-marine transition zone, changing our understanding of the paleogeography of the Western Interior Seaway in western Canada. This study contributes to the validation and development of a systematic approach to the paleoenvironmental reconstruction of ancient river systems based on paleohydraulic analysis.
SEDIMENTARY GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
G. Daners, C. R. Amenabar, G. R. Guerstein, G. Veroslavsky
Summary: Palynological analysis of the uppermost Cretaceous and lowermost Palaeogene sediments in the Gaviotin well in Uruguay identified different marine sedimentary characteristics, which will assist in drilling and hydrocarbon exploration in the area.
MARINE AND PETROLEUM GEOLOGY
(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
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
Geosciences, Multidisciplinary
Mauro Aranciaga Rolando, Mauricio A. Cerroni, Jordi A. Garcia Marsa, Federico l. Agnolin, Matias J. Motta, Sebastian Rozadilla, Federico Brisson Egli, Fernando E. Novas
Summary: This study describes a new genus and species of medium-sized abelisaurid, Niebla antiqua gen. et sp. nov., from Late Cretaceous beds in northern Patagonia, Argentina. The specimen shows autapomorphic features in the braincase and the scapulocoracoid structures, indicating unique characteristics compared to other abelisaurids. The new taxon is relatively small and represents an adult of a mid-sized abelisaurid, adding to the diversity of South American theropods.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Multidisciplinary Sciences
Stephen F. Poropat, Matt A. White, Tim Ziegler, Adele H. Pentland, Samantha L. Rigby, Ruairidh J. Duncan, Trish Sloan, David A. Elliott
Summary: The Snake Creek Tracksite in the Upper Cretaceous Winton Formation of Queensland, Australia, presents an important vertebrate ichnoassemblage, including the first sauropod tracks reported from eastern Australia. This site also preserves a small number of theropod and ornithopod tracks, as well as the first fossilised crocodyliform and possible turtle tracks reported from Australia.
Article
Multidisciplinary Sciences
Ross N. Mitchell, Christopher J. Thissen, David A. D. Evans, Sarah P. Slotznick, Rodolfo Coccioni, Toshitsugu Yamazaki, Joseph L. Kirschvink
Summary: A new high-resolution paleomagnetic record from two overlapping stratigraphic sections in Italy provides evidence for a 12-degree true polar wander oscillation from 86 to 78 million years ago, with the greatest excursion at 84-82 million years ago. This challenges the notion of the spin axis being largely stable over the past 100 million years and represents the most recent large-scale TPW documented.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Romain Vullo, Eberhard Frey, Christina Ifrim, Margarito A. Gonzalez Gonzalez, Eva S. Stinnesbeck, Wolfgang Stinnesbeck
Summary: The newly described Aquilolamna is a bizarre probable planktivorous shark from early Late Cretaceous open marine deposits in Mexico that shows an unexpected evolutionary experimentation with underwater flight among sharks. This long-winged shark with unique body plan belongs to a newly described group (Aquilolamnidae) and may have occupied the ecological niche filled by mobulids and other batoids after the Cretaceous-Paleogene boundary.
Article
Geology
Ana Andruchow-Colombo, Maria A. Gandolfo, Nestor R. Cuneo, Ignacio H. Escapa
Summary: The ginkgophyte lineage has a rich fossil record dating back to the Paleozoic era and is now represented by Ginkgo biloba. A new species, Ginkgoites villardeseoanii, was discovered in uppermost Cretaceous deposits in Patagonia, Argentina, and shows evidence of insect damage, marking the first Cretaceous record of interaction between ginkgophytes and insects in the Southern Hemisphere.
CRETACEOUS RESEARCH
(2022)
Biographical-Item
Plant Sciences
Carlos Jaramillo, David M. Jarzen
Article
Plant Sciences
Bianca Tacoronte Gomes, Maria Lucia Absy, Carlos D'Apolito, Dayenari Caballero-Rodriguez, Camila Martinez, Carlos Jaramillo
Summary: The Neogene played a crucial role in shaping the modern geography and biotic composition of Amazonia. By studying Miocene paleoenvironments and paleoclimate in western Amazonia, researchers identified new species and confirmed a marine flooding event in the middle Miocene. The study also revealed that the average Miocene temperature and precipitation were not significantly different from Holocene estimates.
Article
Geochemistry & Geophysics
Juan S. Jaramillo, Sebastian Zapata, Monica Carvalho, Agustin Cardona, Carlos Jaramillo, James L. Crowley, German Bayona, Dayenari Caballero-Rodriguez
Summary: The study of the Paleocene-early Eocene continental magmatic arc (PECMA) in the Northern Andes revealed that after the collision of the Caribbean Plate, magmas in the PECMA differentiated under a thick continental crust with limited subduction input. Diverse magmatic patterns observed in detrital zircons from 62-50 Ma reflect contrasting crustal architectures, varied temperatures of crystallization, and significant mantle and subduction inputs, suggesting the evolution of the continental crust.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Evolutionary Biology
Carlos De Gracia, Alex Correa-Metrio, Monica Carvalho, Jorge Velez-Juarbe, Tomas Prikryl, Carlos Jaramillo, Juergen Kriwet
Summary: This study presents a new phylogenetic hypothesis for istiophorids, a type of open ocean apex predator. The results show that istiophorid richness is greater than previously assumed, with the family comprising eight genera and 15 species. The study also reveals evolutionary trends in istiophorids, such as a reduction in premaxillary thickness and an increase in narial cavities.
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2022)
Article
Biology
Dimila Mothe, Carlos Jaramillo, Gheny Krigsfeld Shuster, Nychollas Oikawa, Sebastian Escobar-Florez
Summary: This study presents new records of the extinct Notiomastodon platensis from three new fossil sites in the riverbed of Cauca River, Colombia. The findings suggest that this giant mammal used inter-Andean valleys as migratory corridors, possibly due to more suitable environmental conditions and energy-saving terrains. The Cauca Valley deposits have significant paleontological importance in understanding the late Pleistocene of the western region of South America.
HISTORICAL BIOLOGY
(2022)
Article
Geosciences, Multidisciplinary
S. Zapata, L. Calderon-Diaz, C. Jaramillo, F. Oboh-Ikuenobe, J. C. Piedrahita, M. Rodriguez-Cuevas, A. Cardona, E. R. Sobel, M. Parra, V. Valencia, A. Patino, J. S. Jaramillo-Rios, M. Flores, J. Glodny
Summary: A new dataset including detrital U-Pb zircon ages, sandstone petrography, and low-temperature thermochronology from the Southern Central Cordillera were used to construct a paleogeographical model of the Miocene hinterland and foreland regions in the Northern Andes.
Article
Paleontology
Laura Mora-Rojas, Andres Cardenas, Carlos Jaramillo, Daniele Silvestro, German Bayona, Sebastian Zapata, Federico Moreno, Cesar Silva, Jorge W. Moreno-Bernal, Juan Sebastian Jaramillo, Victor Valencia, Mauricio Ibanez
Summary: This study provides an overview of the middle Miocene Konzentrat-Lagerstatte of the La Venta site, which contains valuable information on the biotic response to climatic changes. By compiling published studies and using geological maps and geochronological data, the researchers have established a comprehensive understanding of the Neotropics terrestrial ecosystems during the Neogene. The findings highlight the importance of the La Venta site in understanding Miocene paleoecological dynamics in northern South America, yet further exploration is still needed.
Article
Geosciences, Multidisciplinary
Michele Andriolli Custodio, Martin Roddaz, Roberto Ventura Santos, Pierre-Olivier Antoine, Laurent Marivaux, Narla S. Stutz, Elton Luiz Dantas, Carlos Jaramillo, Melanie Louterbach, Christian Hurtado, Guilherme Oliveira Goncalves
Summary: This study investigates the paleoenvironments of Western Amazonia during the Paleogene through a multi-proxy approach. The results reveal the presence of lacustrine and tide-dominated depositional systems in the Hual-laga Basin, northern Peru. The biostratigraphic and U-Pb zircon dating suggest a hiatus in the depositional record during the Paleocene, and the carbon and oxygen stable isotope values indicate a transition from freshwater to brackish conditions. It is proposed that the Bartonian shallow marine incursion in the Huallaga Basin originated from the north through the Caribbean Sea and might have influenced regional biodiversity patterns in the Paleogene.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Review
Plant Sciences
Carlos Jaramillo
Summary: This review examines the development of South American tropical biomes, specifically their origins and timing. The transition from non-angiosperm dominance to full angiosperm dominance took place during the Cretaceous period. However, there are no existing equivalents to the Cretaceous biomes, as lowland forests lacked closed canopies and were mainly dominated by gymnosperms and ferns. The extant lowland tropical rainforests first emerged in the Cenozoic era with a multistratified forest, angiosperm-dominated closed canopy, and the dominance of major tropical plant families.
Article
Plant Sciences
Luke Mander, Carlos Jaramillo, Francisca Oboh-Ikuenobe
Summary: Fossil pollen and spores provide crucial information about the geological history of tropical vegetation. However, the large number of pollen and spore types encountered makes taxonomy and classification challenging. This study focuses on the Upper Paleocene-Lower Eocene sediments in southeastern Nigeria, describing a palynoflora consisting of 29 spores, two gymnosperm pollen grains, and 138 angiosperm pollen grains. The samples suggest an increase in diversity from the Paleocene to the Eocene in the region.
Article
Geosciences, Multidisciplinary
Xavier Delclos, Enrique Penalver, Eduardo Barron, David Peris, David A. Grimaldi, Michael Holz, Conrad C. Labandeira, Erin E. Saupe, Christopher R. Scotese, Monica M. Solorzano-Kraemer, Sergio Alvarez-Parra, Antonio Arillo, Dany Azar, Edwin A. Cadena, Jacopo Dal Corso, Jiri Kvacek, Antonio Monleon-Getino, Andre Nel, Daniel Peyrot, Carlos A. Bueno-Cebollada, Alejandro Gallardo, Beatriz Gonzalez-Fernandez, Marta Goula, Carlos Jaramillo, Iwona Kania-Klosok, Rafael Lopez-Del Valle, Rafael P. Lozano, Nieves Melendez, Cesar Menor-Salvan, Constanza Pena-Kairath, Vincent Perrichot, Ana Rodrigo, Alba Sanchez-Garcia, Maxime Santer, Victor Sarto i Monteys, Dieter Uhl, Jose Luis Viejo, Ricardo Perez-de la Fuente
Summary: Amber, fossilized resin, has revolutionized our understanding of past terrestrial organisms and habitats. Cretaceous amber outcrops are abundant in the Northern Hemisphere during a 54 million year interval. The extensive resin production during this time, attributed to coniferous trees and climatic dynamics, has led to a remarkable record of terrestrial life known as the 'Cretaceous Resinous Interval' (CREI).
EARTH-SCIENCE REVIEWS
(2023)
Article
Geology
Rafael Francisco Castano-Cardona, Carlos Jaramillo, Andres Pardo-Trujillo, Barbara Vento, Daniela Quiroz-Cabascango, Estefania Angulo-Pardo
Summary: Several Cretaceous amber-bearing localities have been recently discovered in Ecuador and Colombia. A palynological study was conducted to determine their age and assess the floral content. The findings reveal that these localities date back to the late Aptian to early Albian and late Aptian to early Cenomanian, indicating a humid climate in these regions.
BOLETIN DE GEOLOGIA
(2023)
Article
Biology
Aldo Benites-Palomino, Jorge Velez-Juarbe, Carlos De Gracia, Carlos Jaramillo
Summary: New fossil cetaceans from the Upper Miocene Chagres Formation in the Caribbean have been discovered in Eastern Panama. These fossils show similarities with Late Miocene cetacean communities in the Californias in the North Pacific and the Pisco Formation in Peru. This indicates that shallow water marine connection might have facilitated the dispersal of coastal species across both sides of the Isthmus, despite the reduction in deep and intermediate Caribbean-Pacific water interchange during the Middle Miocene.
Article
Geochemistry & Geophysics
Christoph Haggi, B. David A. Naafs, Daniele Silvestro, Dailson J. Bertassoli Jr, Thomas K. Akabane, Vinicius R. Mendes, Andre O. Sawakuchi, Cristiano M. Chiessi, Carlos A. Jaramillo, Sarah J. Feakins
Summary: This study surveys the distribution of brGDGT and isoGDGT in tropical South America and establishes new brGDGT-based temperature models. The results show variations in the distribution of these lipids in different soil types and profiles, and provide insights for paleoclimatic reconstructions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Paleontology
Carlos de Gracia, Felix Rodriguez, Orangel Aguilera, Carlos Jaramillo, Juergen Kriwet
Summary: This study compares the caudal vertebral morphology of extant istiophorid species and describes two fossil vertebrae from the late Miocene of Panama. The results indicate the presence of Makaira sp. and taxa lacking lateral apophyses during the late Miocene, suggesting that the radiation of istiophorids occurred before the Pliocene.
JOURNAL OF VERTEBRATE PALEONTOLOGY
(2022)
