When combined with 40 to 70 per cent. of sand they are TRUE LOAMS and LOAMY SOILS.
But not until they have 90 per cent. of sand in them are they SANDY SOILS.
When combined with from 5 to 20 per cent. of lime, the soils become MARLY.
But not until they have more than 20 per cent. of lime in them are they CALCAREOUS SOILS.
With respect to the slope of repose in clay earths, it may be anything from 1 to 1 TO 12 to 1, and when the clay is mere dried mud and becomes saturated it may not be at rest until it is horizontal.
In cuttings, strong compact clay, if not seriously impaired by air and moisture, will stand at from,
1¼ to 1 TO 1 to 1.
Ordinary clay, such as the blue clay, with protected slopes and proper drainage, and firm boulder clay,
about 1½ to 1
Plastic clay from,