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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 ?
5) The fifth sublayer is composed of grey silty sand with coarse sand and gravels and with a layer thickness of 2-20 m.
The Indiana Department of Environmental Management (IDEM) also concluded that the existence of a continuous layer of silty clay beneath the site had not been proven.
To better understand the long term performance of continuous filament nonwoven needlepunched geotextile filters in contact with fine silty soils, it was decided to exhume geotextiles from two sites that typically represent Asian regional conditions.
However, the final knapping events in the area have been covered by the grey silty sand and left almost in situ.
It was found that the TOC decreased sharply with increasing treatment time for loam, silty loam and silty-clay loam up to two days, then remained relatively constant at the longer treatment time intervals.
Analysis of the results indicates that the investigated wastes possess quality factor, comparable to natural quartz sand and increases after sieving of silty fraction, approaching the rate of Volsky depositsands.
3]; Table 8), although the water retention values were slightly underestimated in soils with silty clay loam texture and overestimated in soils with silty loam texture.
Visual interpretation of the phosphate horizon occurring as a grey silty limestone correlates well with other Georgina Basin phosphate deposits and deeper oil wells logged by the company that also contain significant phosphate levels.
The soil-water characteristic curves observed from the analytical data were compared with the curves predicted from the coefficient values in Eqns 6 and 7 for different coarse-textured (sand, sandy loam, and loamy sand), medium-textured (loam, sandy clay loam, silty clay loam, and clay loam), and fine-textured (sandy clay, silty clay, and clay) soils (Fig.
Using as many as 30 work trains per day, up to 150 pieces of heavy equipment and 200 workers, the railroad installed a million tons of rock to shore up the mountainside and replace the silty soil that slid away Jan 19.
The line was installed in very unstable silty fine sands and clays at depths over 18 feet with a high ground water table.