<em>Promicroceras pyritosum</em> ammonite with serpulid worm cast (18 mm)
<em>Promicroceras pyritosum</em> ammonite with serpulid worm cast (18 mm)
<em>Promicroceras pyritosum</em> ammonite with serpulid worm cast (18 mm)
<em>Promicroceras pyritosum</em> ammonite with serpulid worm cast (18 mm)
<em>Promicroceras pyritosum</em> ammonite with serpulid worm cast (18 mm)
<em>Promicroceras pyritosum</em> ammonite with serpulid worm cast (18 mm)
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Promicroceras pyritosum ammonite with serpulid worm cast (18 mm)

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A highly pyritised ammonite fossil of the species Promicroceras pyritosum from the world-famous Jurassic Coast beach of Charmouth, Dorset UK.

The fossil measures 18 mm (0.7 inches) across. The ammonite is beautifully preserved on both sides with an uncommon serpulid worm cast running along the keel of the shell. These worms attached themselves to ammonites when they were young and grew along with the ammonite, hitching a ride through the Jurassic seas. The ribs are very finely defined and the golden colour is beautiful. A great example of the species and incredible in the flesh.

These pyrite ammonites have long been used to make beautiful natural jewellery.

Around 196 million years old, this fossil would make a wonderful addition to any collection