alluvium

Deposits of alluvium and volcanic ash have made desirable soil that is among the top 2% in the world.

From Seattle Times ● Jun. 16, 2023

Paved surfaces end miles from the rock outcrop, so we drive on overgrown rutted two-tracks that cross the loose sandy dune fields that show up on our geologic maps as “QAL”—Quaternary alluvium.

From Scientific American ● Dec. 15, 2020

Thus, a landscape architect I know savors the very smell of the dirt embedded in his botany texts; it is the alluvium of his life’s work.

From Slate ● Feb. 4, 2020

The island’s geology — a heart of granite in the west, compacted alluvium in the east — is such that most of it could be hollowed out.

From New York Times ● Apr. 20, 2017

At Wisbech one concern alone has a farm of some 900 acres, devoted chiefly to flowers and fruit, the soil being a deep fine alluvium.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" by Various

Hence it was long and erroneously determined that bare rocks in the neighbourhood of shallow alluvia characterise rich placers, and that the wealthiest mining-regions are poor and stunted in vegetation.

From To The Gold Coast for Gold, Vol. II A Personal Narrative by Burton, Richard Francis, Sir

I start with two Mason-bees of the Walls working at their nests on the pebbles in the alluvia of the Aygues, not far from Serignan.

From The Mason-Bees by Teixeira de Mattos, Alexander

We see clearly the alluvia of two streams converging from right and left, and uniting to pass to the sea through Brading Harbour.

From The Geological Story of the Isle of Wight by Hughes, J. Cecil

But it is not often that borings come to be made in river alluvia.

From The Geological Story of the Isle of Wight by Hughes, J. Cecil

S., good sections of these old brecciated alluvia occur.

From Early Days in North Queensland by Palmer, Edward

He pointed out with great clearness the resemblance of the tufaceous matter in the vaults and cellars at Herculaneum and Pompeii to aqueous alluviums, and its distinctness from ejections which had fallen through the air.

From Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology by Lyell, Charles, Sir

Herculaneum was situated several miles nearer to the volcano, and has, therefore, been always more exposed to be covered, not only by showers of ashes, but by alluviums and streams of lava.

From Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology by Lyell, Charles, Sir

There are great tracts of alluviums lying along the banks of the Derwent, the Ouse, and the Trent, and the Romney Marsh of Kent along the banks of the Thames.

From The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide by Various

In the course of ages, a new system of valleys was excavated, so that the rivers ran at lower levels than those at which the first alluviums and sheets of lava were formed.

From The Student's Elements of Geology by Lyell, Charles, Sir

Besides, the last operations of water have a tendency to disturb and confound together all pre-existing alluviums.

From The Student's Elements of Geology by Lyell, Charles, Sir