||Geologic Substrates with less than 50% cover of Rock Substrate. This class uses Folk (1954) terminology to describe any mix
of loose mineral substrate that occurs at any range of sizes—from Boulders to Clay. This hierarchy and the associated terms
are shown in Figure 7.2. These classifications may be based on percent weight (e.g., for retrieved samples); percent cover
(e.g., for plan-view images); or visual percent composition (for other approaches). Units with bracketed letters, e.g., [G],
[mSG], correspond to the labeled polygons in Figure 7.2, using conventions from Folk (1954).