Rich alluvial diamond deposits make Namibia a primary source for gem-quality diamonds.
But the entire Napo country is covered with an alluvial bed, on the average ten feet thick.
As Bates remarks, however, the river valley is not contracted to this breadth, the southern shore not being continental land, but a low alluvial tract subject to inundation.
The lands immediately in the rear of St. Louis, between the Mississippi and the Missouri, below their junction, have an undulated surface, and a deep alluvial soil.
It probably derives its mineral impregnation from some decomposition in the alluvial substances through which it rises to the surface.
They emerge at a great angle of inclination from beneath the alluvial of the plain, and rise abruptly to an elevation of one hundred and fifty or two hundred feet.
All Tierra del Fuego, save for that west coast range, is a great alluvial bed, the work of floods operating during untold ages; and Tierra del Fuego is a triangle-shaped island almost as large as the State of New York.
They had landed on a pebbly beach near the foot of a low, white alluvial cliff into which the elements had eaten holes large enough to be called caves.
At every point one finds steep alluvial bluffs or rounded hills and ridges, with wide arid mesas above and beyond that are of dull colors and without variety.
In the alluvial beds of Patagonia and of Tierra del Fuego are found the petrified remains of the opossum, the kangaroo, and the monkey.
The lofty banks--in fact, everything in sight from the beach--was what geology sharps would call an alluvial formation.
It is an alluvial region; a well-driller would find many layers of sand, gravel, clays, etc.
The Ushuaia bunted and bobbed her way through a head sea for five days before the high alluvial cliffs that mark the entrance to New Gulf loomed through the chilled mist of a storming morning.
A singular-looking diving-bird, carrying only its head above water, gave a novel appearance to this copious reservoir: and there was a rich alluvial flat on the opposite bank.
Of grasses I gathered seeds of twenty-five different kinds, six of which grew only on the alluvial bank of the Darling.
The alluvial bed of the stream consisted of marl, fragments of red quartz, and other rocks.
There is some rich alluvial land on both banks of the Hawkesbury, and some of it, near this road, is let for as much as 20 shillings per acre.
The alluvial portion of the margin of the Darling is narrow, and in most places overgrown with the dwarf box, which is another species of eucalyptus.
In Georgia, for instance, the rich alluvial soil of the swampy coast is devoted to the culture of rice and sea-island cotton, and contains over 60 per cent.
Both geologic histories involve high reliefs, steep slopes, a deep surrounding sea, and hence rarely a shallow continental shelf for the accumulation of broad alluvial lowlands.
Every lapse in governmental efficiency means an encroachment of the desert upon the alluvial fields and finally to the river bank, as to-day in Mesopotamia.
So the negroes of the Guinea Coast, though not immune from fevers, are better nourished on the alluvial lowlands near the abundant fish of the lagoons, and hence are often stronger and better looking than the plateau interior tribes near by.
So on the lower Mississippi, in the greatest alluvial area of the United States, the government has expended large sums for the improvement of the passes and bayous of the river.
In the fertile alluvial plains are wealth, leisure, contact with many minds, large urban centers where commodities and ideas are exchanged.
The distribution of the ancient mounds in North America shows their builders to have sought with few exceptions protected sites near alluvial lowlands, commanding rich soil for cultivation and the fish supply from the nearby river.
They offer advantages that have always attracted settlement--fertile alluvial soil, a nearby water supply, command of a natural highway for intercourse with neighbors and access to markets.
Egypt, which projects as an alluvial peninsula into an ocean of desert from southwestern Asia, has seen its history, from the time of the Shepherd Kings to that of Napoleon, repeatedly linked with Palestine and Syria.
Formosa is divided between its wild Malay aborigines, found on the eastern, mountainous side of the island, and Chinese settlers who cultivate the wide alluvial plain on the western side.
Here periodic rains or melting snows on the ranges fill the drainage streams, whose inundation often converts theiralluvial banks into ready-made fields.
The diameter is seven feet six inches, the whole depth cut through alluvial soil and soft rock receiving water by infiltration through the sides.
The Tells all occur in alluvial soil, and I believe there is scarcely an instance in which water--a spring or a stream--is not found close by.
The economy of the world cannot be arbitrarily carried on in the hope that somewhere a new California, and at the same time a new Australia, will be found whose alluvial lands will give relief for a decade.
The tract lying between these streams consists of a rich alluvial deposit, more or less subject to inundations, but producing good crops of rice, wheat and barley.
The surrounding bluff and alluvial country is very rich.
They began to bore through thealluvial deposit in several directions, and Ogilvie and Rycroft spent their entire time in directing these operations.
He proceeded to read it aloud, emphasizing the words which spoke of the value of the veins of gold beneath the alluvial deposit.
There were no rich veins of gold; there was a certain alluvial deposit, which for a time, a few months, might yield five ounces to the ton.
For six months the alluvial will yield about six ounces to the ton.
The remains collected by him were found in the river Salado, which runs through the flat alluvial plains called Pampas to the south of the city of Buenos Ayres.
Four hundred yards apart the two parties emerged from the sublime portal of the cañon and entered upon the little alluvial plain.
It was as if some charming alluvial valley should suddenly give forth the steam and lava of a volcano.
The slopes of the alluvial soil were dotted with little buttes of mingled sandstone and shale, varying from five to twenty feet in height, many of them bearing a grotesque likeness to artificial objects.
The greater amount of low alluvial soils, like those of the Ganges and Irawaddi, is, in my mind, the truer reason.
But it differs from Polynesia in being continental rather than insular in climate; from South America in the absence of great rivers and vast alluvial tracts; and from Africa in being wholly isolated from the Northern Hemisphere.
The trees that covered the level space at the summit of the ascent, were varieties of a much larger growth than those generally found on the low alluvial strip of land bordering the lagoon.
The rivers which flow through flat alluvial plains frequently exhibit great sinuosities, their waters returning nearly to the same point after an extensive tour.
River-islands are due to original surface inequalities, but many are formed by the arrest and gradual accretion of the alluvial matter brought down by the waters.
Thus the line which divides the primitive and alluvial formations on the coast of the United States, is marked by the falls or rapids of its rivers, while none occur in the alluvial below.
Some of the land thus treated is the rich dark alluvial on the river bank, while a portion is on the higher clay plateau, and consists of land typical of many thousands of acres in the same locality.
The class of land chiefly used for dairying is open forest country, plain scrub land, and rich alluvial flats.
My impression is that gold is spread over the whole country, both in alluvial and in quartz.
The alluvial deposits of most river valleys and some estuaries still in course of formation, containing fossil shells and mammals, all of living species.
We pursued our way over hard alluvial soil to sand, and thence passed into a growth of stiff yellow grass not unlike a stubble in English September.
We then traversed analluvial plain, lately flooded, where slippery mud doubled the fatigue of our cattle; and, at 3 P.
At daybreak I set out with four Arab matchlock-men, and taking a direction nearly due west, waded and walked over an alluvial plain flooded by every high tide.
These alluvial plains are covered with a dense growth of mesquite, cottonwood, willow, arrowwood, quelite and wild hemp.
Through a gorge in the Cordilleras rushes the Rio Ruiz, cold and bubbling, to glide, at last, with breadth and leisure, through an alluvial morass into the sea.
The town lay at the sea's edge on a strip of alluvial coast.
Between the sea and the foothills stretched the five miles breadth of alluvial coast.
Señor Espirition opened negotiations by announcing that the government contemplated the building of a railroad to skirt the alluvialcoast lands.
Somewhere over in that tropical darkness--perhaps already threading the profundities of the alluvial lowlands--the high adventurer and his mate were moving toward land's end.
The spurs of neighboring mountains advanced from all sides close upon Nineveh, and good building-stones, notably the most beautiful alabaster, are found in the plain, under the shallow strata of alluvial earth.
Thus seed raised on hard hills is highly valuable foralluvial soils.
But the large yields of wheat on the Western prairies, and on the rich alluvial soils of California river-bottoms, shows that the best of wheat may grow on other than clay lands.
The deep-black alluvial soils of the Western prairies are an exception to all other soils, possessing, under proper treatment, great powers of production.
It is said to fail on some rich alluvial soils at the West.
The rich alluvial soils of the West are regarded unfavorable to the cherry.
The application of a little common salt on rich alluvial soils, is a great advantage in growing timber.
On very loose soils, as muck land and alluvial soils, the roots of the plants grow too near the surface, and are exposed to being thrown out by winter frosts, and destroyed.
The alluvial soils of the West need no enriching after double-plowing.
It is known that the rich alluvialsoils of the West are remarkable for retaining water in winter.
If allowed to grow as fast as they will incline to, on alluvial soils, when they are exposed to severe winters, they will disappoint growers.
The inferior surface of alluvial deposits is often very irregular, conforming to all the inequalities of the fundamental rocks (fig.
Roads or shelves in the outer alluvialcovering of the hill.
It has long been a matter of common observation that most rivers are now cutting their channels through alluvial deposits of greater depth and extent than could ever have been formed by the present streams.
Even where they chance to be absent in mass, they rarely fail to occur in the superficial gravel or alluvial deposits of the basin of every large river.
For this reason it would be unreasonable to hope that we should ever be able to account for all the alluvial phenomena of each particular country, seeing that the causes of their origin are so complicated.
On closer inspection, we find that these terraces are stratified in the ordinary manner of alluvialor littoral deposits, as may be seen at those points where ravines have been excavated by torrents.
These individuals have been washed away from the alluvial plains of the great river and its tributaries, some from mountainous regions, others from the low country.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "alluvial" in a variety of sentences. We hope that you will now be able to make sentences using this word.
