 |
Unit contains abundant clay having high swelling potential |
 |
Part of unit (generally less than 50%) consists of clay having high swelling potential |
 |
Unit contains abundant clay having slight to moderate swelling potential |
 |
Part of unit (generally less than 50%) consists of clay having slight to moderate swelling potential |
 |
Unit contains little or no swelling clay |
 |
Data insufficient to indicate clay content of unit and/or swelling potential of clay
(Shown in westermost states only) |
