Sedimentary gravels are found in the form of alluvial gravels called the Mangus Valley gravels.

It lies at the confluence of four dry valleys formed by the meltwater at the end of the last ice age which deposited onto the bed rock of chalk, alluvial gravels, silts, on which the town now sits.

The water originates from the Hutt River and is safe to drink in its natural form as it has been naturally filtered through the alluvial gravels and sands of the Hutt Valley over several years.

These sediments include Paleocene to Eocene colluvial, alluvial, and deltaic gravels, sands, clays, and coals and Oligocene to Miocene alluvial, lacustrine, deltaic, and nearshore marine sands and clays that contain beds and lenses of gravel.

The geological structure of the region consists of old and new alluvium, both of which constitute as alluvial deposits mainly of sand, clay, silt, gravels and coarse fragments.

The gems are found in alluvial marble gravels by means of panning, tunneling and digging pits by hand.

The alluvial landscape was formed by the accumulation of eroded and transported recent alluvial sediments consisting of an assemblage of sub-angular to rounded gravels, pebbles and boulders as well as fine materials ( sand, silt and clay ).

Montana moss agate is an agate found in the alluvial gravels of the Yellowstone River and its tributaries between Sidney and Billings, Montana.

Noble Minerals, in cooperation with the local Ba-Ga-Maidi tribe has set up an operation to exploit the alluvial diamonds within 20 square kilometres of diamantiferous gravels of the river system, near Taung.

In early medieval Riez in upper Provence, alluvial silt from two small rivers raised the riverbeds and widened the floodplain, which slowly buried the Roman settlement in alluvium and gradually moved new construction to higher ground ; concurrently the headwater valleys above Riez were being opened to pasturage.

In southern Mesopotamia were the alluvial plains of Sumer and Elam.

The methods had been developed by the Romans in Spain in 25 AD to exploit large alluvial gold deposits, the largest site being at Las Medulas, where seven long aqueducts were built to tap local rivers and to sluice the deposits.

The site of the ancient city is some 5 km from the coast today, but the ancient mouths of Scamander, some 3, 000 years ago, were about that distance inland, pouring into a large bay that formed a natural harbour that has since been filled with alluvial material.

Excavations were also made below the royal tombs layer: a-thick layer of alluvial clay covered the remains of earlier habitation, including pottery from the Ubaid period, the first stage of settlement in southern Mesopotamia.

The typical nuraghe is situated in areas where previous Prehistoric Sardinians Cultures had been distributed, that is not far from alluvial plains ( though few nuraghi appear in plains nowadays, as they were destroyed by human activities such as agriculture, dams and others ) and has the shape of a truncated conical tower resembling a medieval tower ( outside ) or a beehive ( inside ).

The lower levels of site, ever prone to flooding, were gradually buried under waterlogged alluvial soil and accumulated debris ; the original level of track is now buried 6m beneath the modern surface.

Then the Netherlands were finally reunited with the origins of the " alluvial deposits of the French rivers ," of which the country in the view of Napoleon consists.

Taiwan's Austronesian speakers were formerly distributed over much of the island's rugged central mountain range and were concentrated in villages along the alluvial plains.

All sorts of gold records were produced including the " richest shallow alluvial goldfield in the world " and the largest gold nugget.

Geographically speaking, the southern area of the territory is part of the Ponce-Patillas alluvial plain subsector and the southern coastal plain, which were created by the consolidation of the valleys of the southern side of the central mountain range and the Cayey mountain range.

In addition, there are twenty-three fields of alluvial placer gold in the region ( nineteen of which were being developed and prospected in 2006 ) and seven residual soil gold fields suitable for open-cut mining in the southeast.

Settlement came to Blandford and other " hilltowns " some 75 years after more fertile alluvial lowlands along the Connecticut River where tobacco and other commodity crops were cultivated.

In later years, the remains of city were covered with an alluvial earth layer, that formed wet peat.

Some towns such as Stanley, British Columbia | Stanley were predominantly Chinese for many years, while in the Fraser Canyon and even more remote areas such as the Omineca, Chinese miners stayed on to mine claims in wilderness areas. In the goldfields, Chinese mining techniques and knowledge turned out to be better in many ways to those of others, including hydraulic techniques, the use of " rockers ", and a technique whereby blankets were used as filter for alluvial sand and then burned, with the gold melting into lumps in the fire.

One of the largest sites was at Las Médulas, where seven 30 mile long aqueducts were used to work the alluvial gold deposits through the first century AD.

On the first contract, care was needed at the crossing of the River Calder due to the alluvial bedrock, while, on the second, precautions were taken as the length was built on old coal mine workings.

The choice of motte and bailey or ringwork was partially driven by terrain, as mottes were typically built on low ground, and on deeper clay and alluvial soils.

After registering his claim of over 100 ounces of alluvial gold, an estimated 700 men were prospecting in the area within three days.

Wuxi itself is on an alluvial plain of deep sedimentary deposits cut between limestone foothills, making it one of the sources for " scholar's rocks ", the intricately weathered stones which were used as devices for contemplation.

In this region animal husbandry and artisanry were supplemented by some agriculture ( along the alluvial deposits near the rivers ).

The alluvial plains were formed by the Tutaekuri, Ngaruroro and Tukituki Rivers as they flow to the Pacific Ocean at the southern end of Hawke Bay.

Rich alluvial deposits in streams were worked initially by hand miners but there was little recorded production up until approximately 1960.

It is impossible to define narrowly the boundaries of this early land of Chaldea, and one may only locate it generally in the low, marshy, alluvial land about the estuaries of the Tigris and Euphrates, which then discharged their waters through separate mouths into the sea.

Since uplift and erosion are more or less in equilibrium in the Himalaya, rapid uplift is balanced by annual increments of cubic kilometers of sediments washing down from the mountains, then on the plains settling out of suspension on vast alluvial fans or inland deltas over which rivers meander and change course at least every few decades, causing some experts to question whether manmade embankments can contain the problem of flooding.

From the base of the Adelaide Hills to Adelaide's central business district it runs in a shallow valley with a terraced floor, then down the slope of its own alluvial fan.

The Sacred Way was excavated in 1988 under J. de La Genière, and since then much alluvial spoil has been carted off-site and Clarus has been prepared to receive visitors.

Rainfall, especially during the summer monsoon, percolates into the bhabar, then is forced to the surface by finer alluvial layers below it in a zone of springs and marshes along the northern edge of the Terai or plains.

The theme of the museum is the alluvial diamant diggings of this region 1925-1935, then the richest public diggings in the world.

The eroded alluvial deposits from the Bluffs then settled westward to form the Toronto Islands.

Since then, according to Guyana Geology and Mines Commission, Mazaruni River, along with its tributaries ( Meamu, Kurupung and Eping Rivers ), produced over 50 percent all of alluvial diamonds mined up to now in Guyana.

Descending 1, 000 meters onto alluvial plains of the Bum-Chu, also known as the Arun river in Nepal, the highway passes near Shelkar ( New Tingri ) then through Old Tingri, both gateways to Rongbuk Monastery and the north side of Mount Everest.

The rich alluvial soil along the banks of the creek ensured an expanding agricultural community and its location on what was then called the Great Western Road, later renamed to the Great Western Highway, meant that it became a convenient staging post.