(A) Broken Mn-phosphorite pavement slabs from the area near the Wreckfish Cave dive site. (B) Mn-phosphorite pavement slab, with an octocoral colony, collected from the top of the Sponge Cliff dive site. (C) Relict (ancient) sediment ripples that have been encrusted by iron-manganese (Fe-Mn) oxides.
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