[Fossils & History] Why do these fossils have a golden shine? New study reveals origins of preservation

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From Interesting Engineering:

Ammonite fossil from the Ohmden quarry, Posidonia shale lagerstatte ... “When you go to the quarries, golden ammonites peek out from black shale ...

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[Octobot]

From:

Golden Ammonite fossil in grey rock on a black background with a ruler at the edge. Ammonite fossil from the Ohmden quarry, Posidonia shale ...

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