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Old 09-01-2016, 06:35 PM   #55 (permalink)
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Originally Posted by 19bonestock88
So, in laymans terms, sand? Silt? Powdered clay?
Earth made from diatoms. Duh.

Originally Posted by

Selections from Ernst Haeckel's 1904 Kunstformen der Natur (Art Forms of Nature),
showing pennate (left) and centric (right) frustules.
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