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Petrified wood is a fossil. It forms when plant material is buried by sediment and protected from decay due to oxygen and organisms. Then, groundwater rich in dissolved solids flows through the sediment, replacing the original plant material with silica, calcite, pyrite, or another inorganic material such as opal. The result is a fossil of the original woody material that often exhibits preserved details of the bark, wood, and cellular structures.
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Dreams are concealed realizations of repressed desires. - Sigmund Freud
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The Wonders of Creation by Persian scholar Zakariy al-Qazwini
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'Cutting the Stone' by Hieronymus Bosch depicting a trepanation.
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‘The trouble with socialism is that it takes too many evenings’ - Oscar Wilde
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