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Now compare that with this definition of "silt" from the Britannia Concise Encyclopedia:
Sediment particles 0.00016 – 0.0024 in. **(0.004 – 0.06 mm)** in diameter, regardless of mineral type... **An unconsolidated aggregate of silt particles is also called silt**, whereas a consolidated aggregate is called siltstone. Silt deposits formed by wind are known as loess. **Sediments are seldom composed entirely of silt but rather are a mixture of clay, silt, and sand**." http://www.answers.com/topic/silt?cat=technology
See also this American classification of particle sizes and terms, according to which "silt" would cover a very similar range of particle sizes:
Some examples of "silty clays" and "clayey silts":
The geoarchaeological analysis showed sediments relating to fluvial estuarine and marine processes. One important alluvial sequence featuring silts and **clayey silts** with interbedded fine sands was targeted for environmental sampling... Sub-units identified within these major sedimentary units revealed repeated layers of fine sands and **silty clays** which could indicate repeated, possibly seasonal, flooding." http://www.wessexarch.co.uk/projects/marine/alsf/seabed_preh...
"5.4.2. Terrace 2 (Hemington Terrace)
This terrace consists of **clayey silts and silty clays**.
Explanation: [PDF] I. N - File Format: PDF/Adobe Acrobat - View as HTML
0,70-20,00 m loess ground (dusty clays and clayish dusts) with the fluctuation level depth. situated at 18-20m. - Climate ... www.ebrd.com/projects/eias/33391e.pdf - Similar pages
A.Albu Romania Local time: 10:48 Native speaker of: Romanian