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Soft tissue entombment happens first—silica coats and permeates cells before decomposition sets in, preserving microstructure (like in the Rhynie Chert of Scotland).
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Over time, banded agate forms as silica cycles through deposition phases, filling in the cavity with layers of chalcedony and quartz.
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Minerals from volcanic gases (like iron, manganese, or copper) cause colorful agate patterns.
This results in:
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A reptile head, preserved as it was blasted off or buried.
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A snake, petrified whole as silica encased its body.
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An insect, possibly with wings or exoskeleton intact, preserved in microscopic detail.
5. Timescale: From Seconds to Centuries
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Seconds to hours: Organisms killed and coated in silica gel.
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Weeks to years: Gel solidifies into chalcedony; cavities begin to fill.
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Thousands to millions of years: Full agate crystallization and preservation.
Modern Analogs Supporting This Hypothesis
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Rhynie Chert (Scotland): 400-million-year-old ecosystem preserved in silica via hydrothermal activity.
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Yellowstone Hot Springs: Show how silica rapidly precipitates and encases objects.
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Pompeii-Style Events: Sudden death and burial by volcanic gases and ash.
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