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

They had not sunk a shaft, but were removing the entire alluvium down to bed rock.

From A Claim on Klondyke A Romance of the Arctic El Dorado by Edward Roper

They are probably contemporary with the older alluvia.

From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg

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 Sir Richard Francis Burton

Near Orange, for instance, her favourite spots are the alluvia of the Aygues, with their carpets of smooth pebbles no longer visited by the waters.

From The Mason-Bees by Alexander Teixeira de Mattos

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

From Early Days in North Queensland by Edward Palmer

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 Alexander Teixeira de Mattos

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 Sir Charles Lyell

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 Sir Charles Lyell

The whole of them were at first confounded with the superficial alluviums of Europe; and it was long before their real extent and thickness, and the various ages to which they belong, were fully recognised.

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

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 Sir Charles Lyell