Feathers belonging to a griffon vulture that died around 30,000 years ago have become the first fossils of their kind, ...

“Pyrite forms today through the action of sulfate ... edgecombei one of the last surviving species from this group. The ...

Which mineral replaces the original is a function of the chemistry of the groundwater. The ammonoid (the round, snail-ish fossil) has been replaced by pyrite. Pyrite formation requires an absence of ...

Fossil preparation Sectioned view of Oxynoticeras oxynotum, a Late Jurassic ammonite. The yellow pyritised septa are vulnerable to deterioration through pyrite decay. The Gogo fish Eastmanosteus, one ...