Miocene aged silicified Scleractinian coral from Indonesia for #FossilFriday .

I posted this as myself rather than +Fossil Friday because I'll be adding this to my Abstracts and Patterns (Nature) album.

Whole Miocene aged coral reefs have been preserved with surprisingly intricate detail at various spots in Indonesia.

Volcanic activity in the area during the Miocene dumped huge amounts of ash rich in silicon dioxide into surrounding seas and produced conditions perfect for the replacement of the coral's calcium carbonate skeleton with sometimes brightly coloured silica.

  Also for #EarthPatternSaturday curated by +Annette Gretler and +Beat Gretler 
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