The tunnel will traverse multiple difficult subsoil layers: a surface of historical and active landfill materials, including spoil from London tunneling projects and decades-old power station fly ash, a thick layer of alluvium composed of silts, clays, and peat, and, finally, highly variable chalk.
—
Theo Burman,
MSNBC Newsweek,
6 July 2025
At some point, alluvium buried the entire tusk, possibly from major storm flooding.
The latest fossils emerged from a layer of sandy silt just above an extraordinary trackway of hominin footprints made public last year.
—
Katie Hunt,
CNN Money,
15 Oct. 2025
Once river water enters the top of the lake, its slower-moving waters allow silts and other particles to drop to the bottom, and the water that exits the lake and flows further down the river is cleaner.
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