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Latest Sedimentology Stories

8d46964e1ebcb0d9baeeb5f393f8548f1
2011-04-25 14:41:29

Although the dune ecosystem is unusual, fragile and is protected by the "habitats" directive of the network Natura 2000, its conservation is very vulnerable to the proliferation of car parks, nearby buildings and inadequate boardwalks installed for protection or beach access. Researchers at the University of Seville (UoS) have published a study in the Journal of Coastal Research of human impact on the natural dunes at two sites in the Gulf of Cádiz, specifically in the protected areas of...

e98b4c4ebe1089a444a0da54efe3842d1
2011-04-19 10:20:14

The massive subduction zone earthquake in Japan caused a significant level of soil "liquefaction" that has surprised researchers with its widespread severity, a new analysis shows. The findings also raise questions about whether existing building codes and engineering technologies are adequately accounting for this phenomenon in other vulnerable locations, which in the U.S. include Portland, Ore., parts of the Willamette Valley and other areas of Oregon, Washington and California. A...

2011-04-11 05:00:00

HOUSTON, April 11, 2011 /PRNewswire/ -- Texas Rare Earth Resources Corp (OTCQB: TRER) announced today it has begun a stream sediment sampling program at its Round Top Mountain rare earth-beryllium-uranium project in Hudspeth County, Texas which also includes niobium, tantalum and gallium. The objective is to determine if the geochemical signatures from the stream sediments can be used to identify areas of higher grade in the massive rhyolite. To date, a total of fourteen first order...

2011-04-07 16:34:06

The sand along the south-western coastal rim of Norway has drifted for more than 9000 calendar years. This was triggered by sea-level changes and human activities, new research has found. Researchers in countries such as Denmark, the Netherlands and Poland study sand drift, but most of them are focusing on sand dunes along the coastline, not on the plains further inland. "Sand dunes are dynamic. For all we know, they may have been formed last year. But sand plaines are much older and in...

addebb3a4a920c217cb81441fdc9bdd31
2011-02-26 08:12:19

Drier conditions projected to result from climate change in the Southwest will likely reduce perennial vegetation cover and result in increased dust storm activity in the future, according to a new study by scientists with the U.S. Geological Survey and the University of California, Los Angeles. The research team examined climate, vegetation and soil measurements collected over a 20-year period in Arches and Canyonlands National Parks in southeastern Utah. Long-term data indicated that...

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...


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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