Article
Geology
W. C. Clyde, J. M. Krause, F. De Benedetti, J. Ramezani, N. R. Cuneo, M. A. Gandolfo, P. Haber, C. Whelan, T. Smith
Summary: The La Colonia Formation in Patagonia, Argentina preserves important vertebrate and plant fossils, but its precise age and stratigraphic relationship to the K-Pg boundary are not well understood. Through a combination of magnetostratigraphy, U-Pb geochronology, and palynology, this study suggests that the formation may preserve the K-Pg boundary, providing valuable insights into the extinction and recovery dynamics in South America.
CRETACEOUS RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
James S. Eldrett, Manuel Vieira
Summary: This study generated a stable carbon isotope profile of the Early Cretaceous to Paleogene from well 30/2a-7 in the Central North Sea, providing an integrated stratigraphic framework incorporating calcareous nannofossil biostratigraphy and sequence stratigraphy. By correlating with similar records from other realms, it offers a chronostratigraphic framework for hydrocarbon play elements and carbon capture projects.
MARINE AND PETROLEUM GEOLOGY
(2022)
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
Multidisciplinary Sciences
Nathan J. Enriquez, Nicolas E. Campione, Matt A. White, Federico Fanti, Robin L. Sissons, Corwin Sullivan, Matthew J. Vavrek, Phil R. Bell
Summary: The Wapiti Formation in Canada is important for understanding the ecology, diversity, and distribution of terrestrial vertebrates during the late Cretaceous. The Tyrants Aisle locality within the Wapiti Formation represents the largest in-situ tracksite, providing valuable information about the presence and behavior of various dinosaur species. Hadrosaurid tracks are the most abundant, suggesting their dominance in the late Campanian period. The discovery also raises questions about possible social behavior among these dinosaurs.
Article
Geosciences, Multidisciplinary
Mahmoud Sharafi, Matias Reolid, Aram Bayet-Goll, Maryam Mohamadi, Mohammad Khanehbad, Asadollah Mahboubi, Reza Moussavi-Harami
Summary: The carbonate-dominated successions of the Tirgan Formation in the Kopet-Dagh Basin were studied to understand the tectonic and eustatic sea-level effects and autogenic influences on facies changes and sequence stratigraphy. Fourteen facies were identified and grouped into five associations based on depositional settings. A third-order depositional sequence was identified, along with several cycles. The development of the sequences and cycles was controlled by allogenic and autogenic factors. The study provides insights into sedimentary basin evolution and paleogeographic reconstructions.
GEOLOGICAL JOURNAL
(2022)
Article
Geology
Vicente Gilabert, Sietske J. Batenburg, Ignacio Arenillas, Jose A. Arz
Summary: Untangling the timing of the environmental effects of Deccan volcanism with respect to the Chicxulub impact is crucial for understanding their contributions to climate change. Through the study of the Zumaia section in Spain, we have established the temporal relationships between Deccan volcanism and major carbon isotope excursions and planktic foraminiferal events during the KPB. We have also found evidence of abrupt environmental change related to Deccan volcanism.
Article
Paleontology
Alison M. M. Murray, Luke E. E. Nelson, Donald B. B. Brinkman
Summary: A sturgeon skull fragment was found in the latest Campanian sediments in Edmonton, Canada. It represents a new genus and species of Acipenseriformes and is the first documentation of sturgeon in this geological period in North America. The skull exhibits different surface ornamentation patterns on different bones, making it of particular interest.
JOURNAL OF VERTEBRATE PALEONTOLOGY
(2023)
Article
Geography, Physical
Tegan L. Beveridge, Eric M. Roberts, Jahandar Ramezani, Alan L. Titus, Jeffrey G. Eaton, Randall B. Irmis, Joseph J. W. Sertich
Summary: The new research on the Wahweap Formation provides important information about the terrestrial environments and biotic assemblages in the Cretaceous period, including revised stratigraphy and improved geochronology. This is significant for studying the geographic distribution and evolution of dinosaurs.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geology
Madani Benyoucef, Mariusz Salamon, Bruno Ferre, Imad Bouchemla, Rafika Slami, Martina Kocova Veselska
Summary: Thorough sedimentological and palaeontological analyses of four expanded Upper Cretaceous sections in northern Tademait have led to a reconsideration of the stratigraphical framework of the 'Continental Intercalary' and 'Hamada series' in this Saharan area. The studied sections document Upper Cretaceous strata, including clastic formations and various member units, and provide valuable insight into the bio-chronostratigraphical correlations in the region. This research contributes to a better understanding of the sedimentary development and sea level rise during the early Late Cretaceous in North Africa.
CRETACEOUS RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Elizabeth M. Davis, Kurt W. Rudolph, Joel E. Saylor, Thomas J. Lapen, Julia S. Wellner
Summary: The study identifies three main drivers of subsidence in the Western Interior Basin: Mesozoic-early Cenozoic flexure linked to the Sevier Orogeny, Late Cretaceous-Eocene flexure associated with Laramide Uplifts, and Late Cretaceous dynamic subsidence. These factors impact basin geometry and stratigraphic architecture in the region.
Article
Geosciences, Multidisciplinary
H. Petersen, F. C. Jakobsen
Summary: This paper defines the Mandal Formation in the Danish Central Graben and discusses its lithological characteristics, petroleum potential, and depositional environment. The formation is high in oil-prone shale and interbedded reservoir sandstones, formed in a marine environment with restricted oxygen supply. Mitigation structures such as the Coffee Soil Fault also play a role in the formation's composition and distribution.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Thomas M. Lehman, Jacob Cobb, Paul Sylvester, A. Kate Souders
Summary: The contact interval between the Cretaceous and Paleogene strata in the Tornillo Group is characterized by the presence of in situ dinosaur specimens and reworked Cretaceous fossils in a thin conglomerate bed. This contact is disconformal and represents a hiatus of at least three million years. A condensed section and an erosional event are observed in the westernmost exposure, likely due to uplift and deformation. The mammalian fossils in the log jam sandstone belong to an early Tiffanian fauna.
Article
Energy & Fuels
Andrzej Urbaniec, Anna Laba-Biel, Anna Kwietniak, Imoleayo Fashagba
Summary: This study focuses on the poorly recognized Upper Cretaceous complex in the central part of the Carpathian Foreland, using seismic data and seismic sequence stratigraphy to analyze the depositional architecture and identify tectonostratigraphic units. The research fills a gap in the knowledge of paleogeography and explores the impact of eustatic and tectonic factors on sedimentation processes in the Late Cretaceous basin of the Carpathian Foreland.
Article
Geology
Christopher S. Swezey, Bradley A. Fitzwater, G. Richard Whittecar
Summary: The Upper Cretaceous Middendorf Formation is a fluvial sandstone unit that forms a large aquifer in the U.S. Atlantic Coastal Plain. It consists of five facies assemblages, including fluvial bar and channel deposits, floodplain deposits, swamp deposits, traction-dominated current deposits, and iron-cemented deposits. The formation is marked by a pervasive presence of kaolinite, attributed to prolonged weathering and flushing by meteoric water under warm and humid paleoclimate conditions.
JOURNAL OF SEDIMENTARY RESEARCH
(2023)
Article
Geochemistry & Geophysics
Jeremie Aubineau, Fleurice Parat, Abdellatif Elghali, Otmane Raji, Aissam Addou, Clement Bonnet, Manuel Munoz, Olivia Mauguin, Fabien Baron, Moulay Brahim Jouti, Oussama Khadiri Yazami, Jean-Louis Bodinier
Summary: Phosphorus in Moroccan phosphate minerals occurs mainly as microcrystalline carbonate fiuorapatite (CFA) and shows heterogeneous CO32- content at both regional and grain scales. The variations in CO32- content between phosphate basins are likely related to depositional conditions, highlighting the importance of studying the impact of CO32- on grain morphology for potential applications in long-term soil fertilization.
Article
Geology
Sheila M. Trampush, Elizabeth A. Hajek
Article
Geology
Craig Millard, Elizabeth Hajek, Doug A. Edmonds
JOURNAL OF SEDIMENTARY RESEARCH
(2017)
Article
Geosciences, Multidisciplinary
Jean M. Self-Trail, Marci M. Robinson, Timothy J. Bralower, Jocelyn A. Sessa, Elizabeth A. Hajek, Lee R. Kump, Sheila M. Trampush, Debra A. Willard, Lucy E. Edwards, David S. Powars, Gregory A. Wandless
Article
Geosciences, Multidisciplinary
Shelby L. Lyons, Allison A. Baczynski, Tali L. Babila, Timothy J. Bralower, Elizabeth A. Hajek, Lee R. Kump, Ellen G. Polites, Jean M. Self-Trail, Sheila M. Trampush, Jamie R. Vornlocher, James C. Zachos, Katherine H. Freeman
Article
Geology
Ellen P. Chamberlin, Elizabeth A. Hajek
Article
Geosciences, Multidisciplinary
Kyle M. Straub, Robert A. Duller, Brady Z. Foreman, Elizabeth A. Hajek
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2020)
Article
Geosciences, Multidisciplinary
Vamsi Ganti, Elizabeth A. Hajek, Kate Leary, Kyle M. Straub, Chris Paola
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Geology
Evan Greenberg, Vamsi Ganti, Elizabeth Hajek
Summary: This study proposes a new method to quantify the width of rivers by combining extensive lidar data and empirical relations, providing a simple and reliable metric for deriving the width of ancient river channels.
Article
Geology
N. Wysocki, E. Hajek
Summary: The amount of silt and clay available in rivers is influenced by source-terrain composition and weathering, and plays a significant role in shaping the form and dynamics of channel networks. Experimental results indicate that sandy riverbed deposits can retain different amounts of fine sediment under constant and variable discharge conditions.
Article
Geology
Sinead J. Lyster, Alexander C. Whittaker, Gary J. Hampson, Elizabeth A. Hajek, Peter A. Allison, Bailey A. Lathrop
Summary: The study reconstructed the palaeohydrology of Late Cretaceous palaeorivers in central Utah using field measurements and quantitative methods, revealing similarities in river morphologies in space and time, as well as decreasing slopes downstream with a notable increase at the Blackhawk-Castlegate transition. There was no change in unit water discharges at this transition, supporting a tectonic-driven increase in slope rather than a climatically-driven change.
Article
Geology
Douglas A. Edmonds, Harrison K. Martin, Jeffery M. Valenza, Riley Henson, Gary S. Weissmann, Keely Miltenberger, Wade Mans, Jason R. Moore, Rudy L. Slingerland, Martin R. Gibling, Alexander B. Bryk, Elizabeth A. Hajek
Summary: A new style of river avulsion, called retrogradational avulsion, has been identified in densely forested fluvial fans in the Andean and New Guinean alluvial basins. It is initiated by channel blockages that cause overbank flow, creating a chevron-shaped flooding pattern. This new style of floodplain sedimentation has not been accounted for in ecological and stratigraphic models.
Article
Geology
Eric A. Barefoot, Jeffrey A. Nittrouer, Brady Z. Foreman, Elizabeth A. Hajek, Gerald R. Dickens, Tramond Baisden, Leah Toms
Summary: Research suggests that the increased fluvial sediment flux during the Paleocene-Eocene thermal maximum (PETM) may not be attributed to increased water discharge or river slope. Instead, it is likely caused by river morphodynamics and sediment advection under variable-discharge conditions.
Article
Geosciences, Multidisciplinary
Casey J. Duncan, Marjorie A. Chan, Elizabeth Hajek, Diane Kamola, Nicolas M. Roberts, Basil Tikoff, J. Douglas Walker
Summary: The StraboSpot data system has been expanded with vocabulary, standards, and workflow specific to sedimentary geology, allowing geologists to digitally collect, archive, query, and share data. The new Strat Mode modality facilitates data collection, automated construction of measured stratigraphic sections, and preservation of spatial and stratigraphic relationships in the data structure. Incorporating these digital technologies will improve research communication in sedimentology through common vocabulary, shared standards, and open data archiving and sharing.
Article
Geosciences, Multidisciplinary
Elisabeth Steel, Chris Paola, Austin J. Chadwick, Jayaram Hariharan, Paola Passalacqua, Zhongyuan Xu, Holly A. Michael, Hannah Brommecker, Elizabeth A. Hajek
Summary: Understanding the distribution and connectivity of subsurface sandbodies is crucial for characterizing groundwater aquifers and hydrocarbon reservoirs. Analyzing river networks from time-series imagery can provide valuable information for constraining the shallow subsurface. Channel bathymetry and river kinematics have minimal impact on the connectivity of sand bodies, with subsurface architecture primarily controlled by channel location and kinematics.
Article
Geosciences, Multidisciplinary
Timothy J. Bralower, Lee R. Kump, Jean M. Self-Trail, Marci M. Robinson, Shelby Lyons, Tali Babila, Edward Ballaron, Katherine H. Freeman, Elizabeth Hajek, William Rush, James C. Zachos
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2018)