This rock is a chunk of iron pyrite: 180 million years ago, even before many of the most famous land-dwelling dinosaurs ever existed, a marine mollusc called Eleganticeras died and slowly became this ammonite.
— Massimo (@Rainmaker1973) January 3, 2025
[📹 Yorkshire Fossils]pic.twitter.com/Pzh4f7QljQ
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