The study reveals four distinct age distributions in basin sediments, tracing stages of basin formation and reflecting long-term secular variation. These findings shed light on the dynamic interplay of orogenic, erosional, and sediment-transport systems that shaped the region's geology.
A new study published in GSA BULLETIN suggests that linear dunes may have formed through erosion rather than deposition. The research found evidence of erosional origin similar to yardangs in China's Qaidam Basin, which could provide insights into the formation of linear dunes on other planets, such as Saturn's moon Titan.
The Chugach Metamorphic Complex in southern Alaska reveals short-lived metamorphism, while a study of Shiveluch Volcano provides insights into lava dome growth. Meanwhile, a team from Tulane University proposes a new calibration model for the Geomagnetic Polarity Time Scale, and researchers in Tibet explore pulsed Miocene range growth.
Researchers examine evidence for a non-synchronous global event during the end-Permian mass extinction, and study how weak faults form through chemical reactions. They also propose a revised model of geomorphic response to climate change based on observations in Israel.
Researchers examine the link between climate warming and mass extinctions, revealing a direct consequence of Siberian trap volcanism. They also document land-based magnetic lineations similar to those found in sea-floor spreading centers and provide evidence for river drainage system rearrangement linked to ancient civilizations.
New studies reveal mantle-driven uplift in the Rocky Mountains and Colorado Plateau, while also documenting extensional fault systems in the Aegean Sea. Additionally, researchers examine the impact of fault-enhanced irregularities on groundwater flow paths, with implications for nuclear waste repositories.
Researchers investigate giant submarine landslides using subsurface data to understand their form and origin. The study also sheds light on the tectonic history of the Eastern Cordillera and provides new insights into the formation of mountains along the Atlantic margin of northeastern Brazil.
Recent geosphere research interprets Eocene–Early Miocene paleotopography in Nevada and examines the origin of the Colorado Mineral Belt. The study also investigates Miocene magmatism in the Bodie Hills volcanic field, California and Nevada, and compares mountain building processes in Alaska.
Researchers found fossilized fungal hyphae in subseafloor Eocene basalts, suggesting a non-prokaryotic biosphere. This discovery has implications for our understanding of the deep subseafloor environment.
The article discusses the discovery of missing mid-Cenozoic sediments in the Lomonosov Ridge drilling, the variation in the Intertropical Convergence Zone's (ITCZ) position with global climate changes, and the decoupling of taxonomic and ecological severities of major mass extinctions. The ITCZ's position was more southward than today ...
Researchers Richard Saltus and Richard Blakely presented examples of unique interpretations from 'non-unique' models, combining observations to narrow down theoretical solutions. This approach successfully solves important geological issues, such as detailed images of fault zones.
Research highlights the age of continental crust, with over 60% originating in the Archean, 2.5 billion years ago. A new paleomagnetic pole for chron 32 corrects for spreading-rate dependence, improving skewness data accuracy. Seismic ambient noise analysis reveals structural alignments in the Chile Ridge Subduction Region.
Scientists have discovered tranquillityite in Australia's Eel Creek Formation, a mineral previously believed to originate on the Moon. Meanwhile, researchers in Hong Kong present the first three-dimensional seismic velocity model of the region, providing insights into crustal structures and earthquake activity.
Two studies published in GSA BULLETIN examine the evolution of C4-dominated grasslands in the southern Great Plains and the tectonomagmatic evolution of northwestern Mexico. The first study uses carbon isotope composition to reconstruct the relative abundance of C4 grasses over the past 12 million years, finding a protracted history of...
Two studies investigate geological history of Grenville Province and thermal properties of Antarctica's Victoria Land Basin. A new educational program also enhances science education among educators participating in the ANDRILL research initiative.
The December 2011 Geology issue presents several studies. Researchers discovered microfossils in the Tayshir Formation, Mongolia, shedding light on ancient life forms. Additionally, a study investigated melt migration mechanisms, finding evidence for porosity waves in the sub-arc mantle of Kohistan Island Arc.
The November GSA Today science article explores why the Southern Gulf of California ruptured so rapidly, attributing it to an oblique divergence across a thin and hot, weak lithosphere. This process allowed for rapid deformation and stretching of the crust, resulting in new sea floor formation in just 6-10 million years.
Studies explore Ligurian accretionary complex evolution and Andean thrusting, shedding light on continental margin dynamics. Cosmogenic isotope analysis reveals insights into the geological history of Wonderwerk Cave and Redoubt Volcano.
Researchers have made significant findings on the San Andreas Fault and Japan's 1944 Tonankai earthquake. The study reveals that seismic slip can propagate to shallow levels along megasplay faults, while another discovery sheds light on osmium behavior in a subduction system using chromian spinel from Bonin Island beach sands.
Researchers re-examining the Hesperia Planum on Mars have discovered a complex landscape with narrow, sinuous channels that defy explanation. The team, led by Tracy Gregg, is seeking help from scientists studying similar features on the Moon to shed light on the channels' origins.
Geologists Jay Quade and his team discovered rubbing boulders in the Atacama Desert that have been smoothed by seismic activity over millions of years. The phenomenon, which resembles a crowded train station, answers long-standing questions about erosion and landscape evolution.
Researchers at the Geological Society of America meeting connect extreme weather events over the past decade to climate change. Warmer oceans, fueled by increased carbon dioxide and greenhouse gas releases, contribute to more frequent and intense storms, droughts, and wildfires.
The increasing demand for rare earth elements and critical minerals poses significant geopolitical challenges, threatening the global clean energy economy. The US, China, and other countries are exploring strategies to secure domestic supplies and mitigate supply risks.
Researchers have discovered a remarkable fossil site in Nevada where the remains of nine 45-foot-long ichthyosaurs suggest an even larger and more cunning sea monster existed: a Triassic kraken. The evidence implies that this ancient cephalopod was capable of intelligent manipulation of bones and preyed on these massive reptiles.
A new study suggests that short-hard interstellar radiation events could have a significant impact on life on Earth, depleting the ozone layer and allowing deadly ultraviolet radiation to penetrate. The rate of these events is estimated to be about once per 100 million years, with potential effects on extinctions in the fossil record.
The new GSA field guide covers a diverse range of geological topics in Minnesota and the surrounding region, including Precambrian geology, economic geology, and glacial geology. The guide features 25 field trips and provides best practices for educators conducting geology course field trips.
Researchers have uncovered a compound monogenetic volcano at Ilchulbong, Jeju Island, revealing multiple magma pulses and vent shifts. Additionally, petrographic analysis of Enkingen impact breccias indicates significantly more than previously estimated impact melt volume.
Two studies examine the Jemez-Embudo Accommodation Zone in New Mexico and the Tennessee Salient in Appalachia, shedding light on tectonic processes. Geodynamic models and paleomagnetic data reveal no statistically significant rotation in the Rio Grande Rift and indicate a more complex history of curvature formation.
Researchers studied arroyo cycles and canyon paleoflood records in Utah, magma formation in the Karakoram shear zone in India, and brine origin in the Alberta Basin. They found that arroyo cycles control chronologies of paleoflood sequences and that magma formation in the Karakoram shear zone provides pathways for removing magma from d...
Researchers found diverse mineralogies in two troughs of Noctis Labyrinthus, Mars, indicating a potentially habitable environment and liquid water presence. Additionally, studies on EarthScope seismic observations and the formation of high delta18O fayalite-bearing A-type granite reveal key factors for these unique rock types.
The September issue of GSA Today focuses on the Upper Midwest's geology, introducing the Mid-Continent Rift System and its evolution. The articles also emphasize the role of geologists in sustainable resource use and long-term resilience.
Researchers study paleo-hurricane records from South Carolina marshlands and find that spatio-lateral continuity of hurricane deposits is poor. High-precision geochronology of the Chinle Formation provides new insights into early dinosaur evolution and temporal constraints on their evolution.
Recent studies in California's Poison Lake chain, the Kyushu region of Japan, and the Cuyama River in California have revealed diverse volcanic formations and complex tectonic interactions. In California, research suggests that discrete batches of basalt erupted along a short normal fault zone, while in Japan, volcano-tectonic processe...
The August 2011 Geosphere issue explores the tectonic influence on the Surveyor Fan and Channel system in the Gulf of Alaska and reviews advancements in measuring currents in submarine canyons. It also delves into the origin and evolution of the Sierra Nevada magmatic arc and the consequences of lithospheric removal in California.
The special 'Fragile Earth' field guide examines records and recording tools of geological processes, including plate motions and deep crustal structure. The conference in Munich, Germany, focuses on global to local scales and associated hazards and resources.
Debris flow hazard assessment and dune migration in Antarctica are among the highlights from the September issue of GEOLOGY. Additionally, a new study has confirmed the existence of the Luizi impact structure in Central Africa, while another research reveals a determination of fungal disease's role in Permian woodland deterioration.
Researchers found identical lead isotopes in ancient rocks from North America and Antarctica, suggesting a connection between the two continents 1.1 billion years ago. This discovery strengthens support for the SWEAT hypothesis and provides critical clues to the geographic relationships between major continents.
The Geological Society of America recognizes Paul F. Hoffman, Susan L. Brantley, Jasper A. Vrugt, Naomi E. Levin, A. Wesley Ward, Scott F. Burns, Richard C. Berg, and Brendan Murphy for their exceptional contributions to geology, hydrogeology, paleoclimate, and public service.
A groundbreaking study compiled 1528 calculations of surface erosion rates from 80 study areas worldwide. The analysis found that bare rock outcrops had significantly lower erosion rates than surfaces covered with thin layers of soil, highlighting the global importance of soil formation as a geomorphic process.
Researchers analyzed U-Pb-Hf characterization of the central Coast Mountains batholith, finding spatial and temporal trends in petrogenesis. They also discovered no correlation between Anderson Reservoir stage level and underlying Calaveras fault seismicity, despite calculated differential stress increases.
This article covers various geological topics from August 2011, including microbial activity in banded-iron formations, the San Andreas fault system's deformation patterns, and earthquake hazards. Researchers also investigated porosity redistribution in crystal-rich magmas and boundaries conditions on laboratory models of simple shear.
Two studies highlight the relationship between neotectonic activity and rockslide failures, with a third investigation into salinity control on parasequence development in ancient carbonate platforms. Researchers found that rock fracturing due to neotectonic activity is a major conditioning factor for failures, while changes in coastal...
Researchers used clinker deposits and U-Th/He isotopic dating to determine the pace of recent evolution in the Powder River Basin. The study found that the basin has experienced increasing incision and topographic relief over the last million years, with rates of up to 0.3 km/million years.
A new themed issue of Geosphere delves into the geology and tectonic history of northern San Francisco Bay region, featuring studies on sedimentary and volcanic deposits cut by active strike-slip faults. The papers provide insights into groundwater hydrology, seismic hazard, and plate margin evolution.
Researchers explore potential causes of widespread gullying on the southeastern Tibetan Plateau, find evidence of late Quaternary development in river valleys of the Karakoram Himalaya range. Paleovalley morphology studies reveal insights into climate and tectonic controls on sedimentation.
A team of scientists has created a curved cross-section of the North American continent, extending from the Cascadia subduction zone to the Atlantic margin. The cross-section reveals scars of ancient continental collisions and eons of oceanic subduction, indicating processes that have shaped the continent for over three billion years.
Researchers studied sediment transfer from land to deep sea using LiDAR and cosmogenic radionuclide-derived erosion rates. They found that sediment fluxes influence landscape evolution and geochemical cycling. Additionally, unique sedimentary desiccation structures were discovered in Bahamian ooid grainstone.
Scientists have discovered new records of shelled amoebas living with methane seeps and ancient trilobites. Additionally, researchers have found evidence of micrometeorites in 240 million-year-old sediments and a deep biosphere community in the Atlantic Ocean.
Researchers found that the accretion of microcontinental blocks significantly affects continental growth, with potentially greater early crust than estimated. Paleosol analysis revealed optimal water-holding potential and fertility levels for subtropical soils from the late Cretaceous period.
Researchers studied freshwater fish fossils to understand the Neogene water cycle in Central Africa. A study proposed that Nuna was Earth's first supercontinent. Ancient cave systems near the Allgau Mountains preserved the oldest radiometrically dated dripstones known in the European Alps.