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The seaweed is interesting but the mention of a gomphothere is even more interesting.[en.wikipedia.org] Now the Wiki article mentions that they belonged in the Miocene and Pliocene epochs. Their survival in South America until 14,000 years ago could explain the 4 tusked 'mammoth' sketched on that engraved mammoth pelvis found by Juan Armenta Camacho at Valsequillo.
Where I live on the East coast of Canada, bags of dried seaweed can be bought at many stores.
We call it Dulce.