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predominantly quartz mineral particles that are between sand size and clay size, i.e., between 1-16 and 1-256 mm ( 1-406 – 1-6502 in.) in diameter. Silt, like clay and sand, is a product of the weathering and decomposition of preexisting rock. Hardened silt forms a sedimentary rock called siltstone, which tends to deposit in thin layers sometimes referred to as flagstone because it is hard, durable, and flat, breaking into nearly rectangular slabs.



the fine-grained, soft sediment on the bottom of bodies of water, not altered by diagenesis. Between 30 and 50 percent of the particles it contains are less than 0.01 mm in size. Occurring in a fluid state under natural conditions, it assumes the properties of a solid body when dry. On the bottom of seas and continental bodies of water (lakes, rivers, and ponds) there are silts consisting of fine-grained products of rock decomposition (terrigenous, clayey, and lime silts) and silts made up of microscopic shells or the skeletal remains of marine organisms (globigerina, diatomaceous, radiolarian, pteropod silts). Silts that have been enriched by volcanic ash (volcanic mud) form a separate category. Sometimes silts are enriched with organic matter (sapro-pel) whose decay causes hydrogen sulfide contamination or putrefaction (“putrid silt”).

Some silts, including lake, pond, and lagoon silts, are used as fertilizer and for mineral feed supplements for livestock; they are also used in medicine, for pelotherapy.


A rock fragment or a mineral or detrital particle in the soil having a diameter of 0.002-0.05 millimeter that is, smaller than fine sand and larger than coarse clay.
Sediment carried or deposited by water.
Soil containing at least 80% silt and less than 12% clay.

silt, inorganic silt, rock flour

A granular material that is nonplastic or very slightly plastic and exhibits little or no strength when air-dried; usually has a grain size between 0.002 mm and 0.05 mm in diameter.


a fine deposit of mud, clay, etc., esp one in a river or lake
References in periodicals archive ?
The layer is intercalated with sandy or silty clay lense in the northern part under VES.
This paper presents a parametric study focusing on estimating the undrained liquefied shear strength of silty sand using state parameters and the geotechnical properties of the mixtures.
At depth 1 m in Zone 5, clay and silty clay or clayey silt (CL, CL-ML) cover 50 % area ,silt (ML) covers 1 % area, clayey gravel and poorly graded gravel (GC, GP) cover 49 % area.
08 for a silty clay loam soil (Table 3), which was the soil type that was used in the study of Grable and Siemer (1968).
But over time Warsak Dam has become quite silty as compared to other dams.
This research examines the paleoenvironmental significance, and possible origins, of anomalous silty deposits in the Evart Upland--a dry and otherwise sandy, interlobate landscape in southern Michigan.
The XRD results clearly shows that the soil in Lahore area is predominately composed of Quartz, Muscovite and Clinoclore as major minerals and can be classified as silty clay.
U of A geologists Ernesto Pecoits and Natalie Aubet in Uruguay found fossilized tracks of a centimetre long, slug-like animal left behind 585 million years ago in a silty sediment.
Among the events on offer were giant gourd racing, duck catching, and wading through the silty riverbed whilst balancing jars on your head.
The surface of the investigation site was levelled and the major part of the area was replaced with manmade soil (tplIV) consisting of silty sand (SU, SUo), low plasticity clay (TL), intermediate plasticity clay (TM), silty clay (TU) and gravel sand (GU).
Soil type in this coastal area is very soft silty clay or marine clay layered with a thin layer of silt or fine sand.