A nice Strand Beach image:
Strand lines on aragonite sand beach (Hanna Bay, northeastern San Salvador Island, eastern Bahamas)
Image by James St. John
Strand lines on aragonite sand beach (looking ~south) at Hanna Bay, northeastern San Salvador Island, eastern Bahamas.
Strand lines are ridges of organic and inorganic debris on beaches that represent the maximum landward extent of the tides. The strand lines shown above are principally composed of dead and desiccated "seaweed", overwhelmingly consisting of Sargassum brown algae (Phaeophyta), plus the angiosperms Thalassia (turtle grass) and Syringodium (manatee grass). The brownish-colored clumps in the strand line on the left, near the water, were left “high and dry” by the most recent high tide. The blackish-colored strand lines on the right, higher up on the beach, were left by the last high high tide (spring tide).
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