Classified by substrate composition
The Alaska Shorezone Project spatial database classifies intertidal beaches in many ways. One of the most useful is substrate size.
Beaches can be subdivided into 3 groups:(1) exposed bedrock; (2) unconsolidated beaches with coarse material such as boulders, cobbles, or gravel; and (3) sand beaches. Note that estuaries are discussed on a separate page.
Here’s an annotated video showing beach zones:
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