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Slightly Gravelly (Substrate Group)

Component: Substrate

Unique Identifier: 278

Substrate Origin Geologic Substrate
Substrate Class Unconsolidated Mineral Substrate
Substrate Subclass Fine Unconsolidated Substrate
Substrate Group Slightly Gravelly
Substrate Subgroup Slightly Gravelly Sand
Slightly Gravelly Muddy Sand
Slightly Gravelly Sandy Mud
Slightly Gravelly Mud

Definition Geologic Substrate surface layer contains from a trace (0.01%) of Gravel to 5% Gravel (particles 2 millimeters to < 4,096 millimeters in diameter). For more specificity in this group and in the following four substrate subgroups, the median size of "Gravelly" may be substituted in, e.g., "Slightly Granuley", "Slightly Pebbly Sand", "Slightly Cobbley Muddy Sand", and "Slightly Bouldery Mud".