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Gravel Mixes (Substrate Group)

Component: Substrate

Unique Identifier: 269

Substrate Origin Geologic Substrate
Substrate Class Unconsolidated Mineral Substrate
Substrate Subclass Coarse Unconsolidated Substrate
Substrate Group Gravel Mixes
Substrate Subgroup Sandy Gravel
Muddy Sandy Gravel
Muddy Gravel

Definition Geologic Substrate surface layer contains 30% to < 80% Gravel (particles 2 millimeters to < 4,096 millimeters in diameter). For more specificity in this group and in the following three substrate subgroups, the median size of "Gravel" may be substituted in, e.g., "Pebble Mixes", "Sandy Boulder", "Muddy Sandy Cobble", and "Muddy Granule".