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PALEONTOLOGY
Fossilization
Opalised Plesiosaur
Opalised plesiosaur fossils reveal ancient marine reptiles preserved in dazzling gemstone form
29 Jan 2026
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What geological condition is essential for the opalisation of plesiosaur fossils?
Presence of silica-rich water that deposits opal in the fossil's structure
High-temperature volcanic activity that melts the fossil into opal
Exposure to sunlight that transforms bone material into opal
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