Kenneth Page Oakley; The organic content of Recent rhyolitic ashes in Malaya. Geological Magazine ; 77 (4): 289–294. doi:
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The remains, chiefly fresh-water diatoms and opaline rods believed to be plant structures, do not include sponge spicules, signs of marine deposition. Small opal spicules found may be inorganic, or casts of vegetable material.
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