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Latest Sedimentology Stories

2011-02-24 15:34:19

A group of researchers have studied the history of drought in the Pacific Northwest during the last 6,000 years, a time that spans the mid-Holocene geological epoch to the present. The goal of the research was to improve the understanding of drought history because the instrumental record of drought only goes back a few hundred years and at relatively few locations. Their work extended the drought history of the Pacific Northwest back much longer than the tree ring record, which provides...

2011-02-23 17:46:53

Much of the Mississippi River's sediment load doesn't come from field runoff, according to work by scientists at the U.S. Department of Agriculture (USDA). Instead, the scientists with USDA's Agricultural Research Service (ARS) have confirmed that stream bank collapse and failure can be chief contributors to high sediment levels in the silty streams and rivers that flow into the Mississippi. ARS is USDA's chief intramural scientific research agency. The U.S. Environmental Protection Agency...

2011-02-22 14:17:03

Research published today reveals the previously unidentified role that fish play in the production of sediments in the world's oceans, and specifically of the carbonate sediments that contain critical records of changes in ocean chemistry and climate shifts in the geological past. The discovery, made by a team of scientists from the UK and US, helps explain the origins of a key component of marine sediments "“ the fine-grained carbonates, the origins of which are often problematic to...

2011-02-02 12:07:00

Geologist cites safety and necessity of Marcellus Shale development UNIVERSITY PARK, Pa., Feb. 2, 2011 /PRNewswire-USNewswire/ -- In the midst of political debate over natural gas development in Philadelphia, Penn State Geosciences Professor Michael Arthur highlights the incongruities in local anti-fracing movements: "Practically all U.S. natural gas development involves hydraulic fracturing, so it would be very difficult for consumers to discriminate specific natural gas sources because...

2011-01-25 12:26:18

By adding information about the subsoil to an existing sedimentation and erosion model, researchers at TU Delft have obtained a clearer picture of how rivers and deltas develop over time. A better understanding of the interaction between the subsoil and flow processes in a river-delta system can play a key role in civil engineering (delta management), but also in geology (especially in the work of reservoir geologists). Nathanaël Geleynse et al. recently published on their...

2010-11-23 12:56:24

Southampton scientists along with colleagues in New Zealand have used a sophisticated optical mapping technique to identify and accurately measure changes in coastal morphology following a catastrophic series of landslides. "Our findings are important for assessing geological hazards and reducing the dangers to human settlements," said geophysicist Professor Jon Bull of the University of Southampton's School of Ocean and Earth Science based at the National Oceanography Centre, Southampton,...

2010-09-28 20:12:21

Understanding Missouri River's Sediment dynamics key to protecting endangered species, setting water quality standards, says new report A new report from the National Research Council says that more organized and systematic procedures for gathering and evaluating data on Missouri River sediment are required to improve decisions and better manage the river's ecosystem, including protecting endangered species and developing water quality standards. In addition, the report finds that the U.S....

2010-08-09 15:52:00

NOVATO, Calif., Aug. 9 /PRNewswire/ -- Today, as the California Senate considers major new recommendations to increase freshwater flows to the San Francisco Bay-Delta estuary, the Bay Institute released Gone with the Flow, a primer on how flows support a healthy ecosystem, and how the lack of flow is degrading that ecosystem to the point of collapse. The primer is available for free at http://www.bay.org/assets/Gone%20with%20the%20Flow%20WEB%20FINAL.pdf. "Flow is the most important driver...

2010-07-21 14:47:00

NOVATO, Calif., July 21 /PRNewswire/ -- Today, the State Water Resources Control Board released its long awaited draft report, identifying new flow criteria for the endangered Delta ecosystem. The report recognizes that the Delta ecosystem is getting far less water than is needed to protect public trust resources, and recommends new flow criteria that would significantly improve conditions in the estuary, based in large part on analyses and recommendations developed by The Bay Institute....

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2010-07-06 10:30:16

The method predicted 2008 dust storm at New Mexico's White Sands Dune Field using temperature images from NASA's Earth-orbiting ASTER instrument, team reports in the Journal of Geophysical Research Earth Surface Researchers based at the University of Pittsburgh have developed a method for predicting dust and sandstorms that uses infrared satellite images to determine when conditions are ripe for the destructive phenomena, a technique that could be implemented globally and that the research...


Latest Sedimentology Reference Libraries

River Delta
2013-04-18 22:36:25

A river delta is a landform that is created at the mouth of a river, where the river flows into an ocean, estuary, lake, sea, or reservoir. These deltas are built from the deposition of the sediment that is carried by the river as the flow exit’s the mouth of the river. Over a long period of time, this deposition constructs the distinctive geographic pattern of a river delta. The creation of a delta is made up of three core forms: the bottomset, topset, and foreset/frontset. Bottomset...

28_b760796d3dace508242e89fc53d49081
2005-05-26 11:13:08

In geology, a conglomerate is a rock consisting of other stones that have been cemented together. Conglomerates are sedimentary rocks consisting of subangular clasts and are thus differentiated from breccias, which consist of angular clasts. Both conglomerates and breccias are characterized by clasts larger than sand (>2 mm). There are two varieties of conglomerate, defined by texture: paraconglomerates and orthoconglomerates. Paraconglomerates are one of two varieties of conglomerate...

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Word of the Day
abrosia
  • Wasting away as a result of abstinence from food.
The word 'abrosia' comes from a Greek roots meaning 'not' and 'eating'.