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    Spiral ammonite fossil on black background. — Stock Photo
    Spiral ammonite fossil on black background.
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Arachnoidiscus sp. diatom algae — Stock Photo
    Arachnoidiscus sp. diatom algae
    Turkey, Aegean region, Pamukkale (cotton castle) (tuffaceous site formed by mineralized sources of hot water) — Stock Photo
    Turkey, Aegean region, Pamukkale (cotton castle) (tuffaceous site formed by mineralized sources of hot water)
    Silica wall of a diatom — Stock Photo
    Silica wall of a diatom
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Polished sectioned ammonite fossil on black background. — Stock Photo
    Polished sectioned ammonite fossil on black background.
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Arachnoidiscus sp. diatom algae — Stock Photo
    Arachnoidiscus sp. diatom algae
    Silica wall of a diatom — Stock Photo
    Silica wall of a diatom
    Turkey, Aegean region, Pamukkale (cotton castle) (tuffaceous site formed by mineralized sources of hot water) (UNESCO World Heritage) — Stock Photo
    Turkey, Aegean region, Pamukkale (cotton castle) (tuffaceous site formed by mineralized sources of hot water) (UNESCO World Heritage)
    Freshwater single diatom — Stock Photo
    Freshwater single diatom