earthstory: An agatised branch When volcanic ash engulfs forests during explosive eruptions the wood is often replaced when silica from the ash is remobilised by percolating groundwater, sometimes in exquisite detail preserving cellular structure. Other

earthstory: An agatised branch When volcanic ash engulfs forests during explosive eruptions the wood is often replaced when silica from the ash is remobilised by percolating groundwater, sometimes in exquisite detail preserving cellular structure. Other

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from: https://gorloj.tumblr.com/post/155310244080