The uppermost beaches are gravel, the mid-tide beach is almost entirely oysters (big, non-native ones, as I understand) and barnacle encrusted cobbles, and the lower beach is a sandy, with eelgrass covering the lowest intertidal.
These thick intertidal oyster beds are pretty common on Hood Canal. If these aren't natives, I wonder what the beaches looked like, or behaved like, prior to their arrival.
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