|
Fraction
|
Size range
(µm) |
Subfraction
|
Size range
(µm) |
|---|---|---|---|
| Sand | 2000.0~63.0 | Fine sand | 250.0~125.0 |
| Very fine sand | 125.0~63.0 | ||
| Silt | 63.0~3.9 | Coarse silt | 63.0~31.0 |
| Medium silt | 31.0~15.6 | ||
| Fine silt | 15.6~7.8 | ||
| Very fine silt | 7.8~3.9 | ||
| Clay | <3.9 |
|
|
Note: From the classification of Friedman and Sanders (1978).