Cob: CLAY as a component of COB, or UNFIRED EARTHEN MASONRY.

[Darel Henman]

Thanks for the post Patrick,

It's my understanding that the professionals use the grain size more
than anything else to classify soils between clay, silt, and then sands
of various levels.  Although it doesn't seem that they go into the
actual qualities of types of clay.


Darel