Coastal and Marine Ecological Classification Standard
CMECS
Substrate
Geologic Substrate
Unconsolidated Mineral Substrate
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Coarse Unconsolidated Substrate
Substrate Subclass: Geologic Substrate surface layer contains > 5% Gravel (particles 2 millimeters to < 4,096 millimeters). These sediments are classified using the upper three rows of the Folk (1954) Gravel-Sand-Mud diagram.
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