A hard substratum composed of a mix of Consolidated Hard Substrata and Unconsolidated Hard Substrata where neither class is dominant (i.e. does not exceed ≥ 80 %) of the substratum surface/composition.
A hard substratum composed of a mix of Consolidated Hard Substrata and Unconsolidated Hard Substrata where neither class is dominant (i.e. does not exceed ≥ 80 %) of the substratum surface/composition.