Articles tagged with Sedimentary Rocks
A massive extinction event occurred 200 million years ago, wiping out 76% of species on Earth. Volcanic eruptions from the Central Atlantic Magmatic Province likely triggered the event through global warming and ocean acidification.
The Geological Society of America published a special series of invited papers to mark its 125th anniversary, including a revised geologic time scale. The articles cover various topics such as mammal fossils, sediment delivery rates, volcanic material provenance, and ecosystem changes.
A Caltech-led team has debunked a long-held theory about the end of the Marinoan ice age, also known as the "Snowball Earth" ice age. The team found that rocks used as key geologic evidence were formed deep within Earth millions of years after the ice age ended
Expedition 322 collected sedimentary and basement rock samples from the Shikoku Basin, shedding light on the generation of large earthquakes. The study of petrological, geotechnical, frictional, and hydrogeological properties of these rocks is crucial for understanding rupture dynamics in the seismogenic zone.
Researchers have dated mountain-building events in the eastern Andes range of Colombia to 25 million years ago, contradicting previous estimates of 10-15 million years. This new finding sheds light on the geological history of the region and its importance for understanding ancient animal migration patterns and oil-gas exploration.
The Tibetan Plateau's rise is now believed to have occurred in stages, with the central part uplifting first at least 40 million years ago. This finding has significant implications for understanding major episodes of global climate change.
Researchers found that microbial communities change the rate of calcium carbonate precipitation, which can affect the chemistry and shape of crystals. This discovery could help date certain sequences of sedimentary rock and search for evidence of life on other planets.
Researchers have found that muds can accumulate even when currents move swiftly, contradicting long-held assumptions. This discovery has significant implications for harbor and canal engineering, oil reservoir management, and fossil fuel prospecting.
Researchers found that sedimentary zircon grains from Oregon basins have similar mineral ages to those in the Klamath Mountains and Sierra Nevada ranges. This suggests a Jurassic connection between these geological formations.
Researchers at Ohio State University used high-resolution carbon isotope stratigraphy to determine the age of Niagara Gorge rocks, finding they formed five times faster than previously thought. This new information will impact studies of global climate change and require scientists to re-examine previous work.
A new study reveals the San Jacinto fault is no older than 1.1-1.3 million years, with its slip rate likely faster than previously thought. The fault's long-term motion may be as high as 20 millimeters per year, making it a significant contributor to seismic hazards in southern California.
Researchers believe that parts of ancient Mars may have resembled a land of lakes, with layered geologic outcrops suggesting sedimentary rock deposited in horizontal layers. The discovery suggests an extremely dynamic environment on early Mars, with water likely playing a key role in shaping the planet's geology.
Researchers analyzed Precambrian sedimentary rocks to track the evolution of oxygen and ozone in the early atmosphere. The study found a 'profound change' in chemical reactions involving sulfur, indicating limited free oxygen and a global signature.
Fossils of crocodile-like champsosaurs, turtles and fish found in high Canadian Arctic reveal extremely warm temperatures. The findings suggest that volcanic eruptions dumped large amounts of carbon dioxide into the atmosphere, causing global warming.
Scientists confirm British Columbia was once nearly 2,000 miles south of its current location based on fossil evidence and magnetism. The discovery supports the theory of massive Earth movements along a gigantic faultline.
A significant reservoir of methane and hydrocarbons has been discovered in rock beneath the ocean floor, potentially supporting a wide range of microorganisms. The findings, presented by University of Washington oceanographer Deborah Kelley, suggest that these microbes may thrive on chemicals toxic to other life forms.