Caumontisphinctes polygyralis Ammonite Fossil | Parkinsoni Zone, Bajocian, Jurassic | Milborne Wick Dorset UK | Alice Purnell Collection

Description

Fossil Type & Species:

This listing offers a genuine ammonite fossil of Caumontisphinctes polygyralis, an elegant and scientifically notable species from the Parkinsoni Zone of the Bajocian Stage, Middle Jurassic. Collected at Milborne Wick, Dorset, United Kingdom, this piece comes from the well-curated Alice Purnell Collection, known for rare, well-documented British fossil specimens.

Geological Formation & Insight:

Caumontisphinctes is a genus of highly ornamented ammonites within the family Parkinsoniidae, notable for their compressed whorls and strikingly ribbed shells. The species C. polygyralis is particularly useful in biostratigraphy, serving as a zonal fossil within the Parkinsoni Zone (~170 million years ago) of the Bajocian Stage.

This fossil was recovered from the Inferior Oolite Group, a sequence of marine limestones and calcareous sediments deposited in warm, shallow seas during the Jurassic. The Milborne Wick locality in Dorset is part of this important oolitic limestone belt and is famous for yielding ammonites of remarkable preservation and scientific relevance.

These deposits capture a moment in Earth’s history when southern Britain lay beneath a subtropical sea filled with marine life including ammonites, brachiopods, bivalves, crinoids, and marine reptiles. The exceptional fossil content of this zone has made Dorset a global reference point for Middle Jurassic ammonite stratigraphy.

Item Specifics:

• Fossil Type: Ammonite
• Species: Caumontisphinctes polygyralis
• Geological Age: Parkinsoni Zone, Middle Bajocian Stage, Middle Jurassic (~170 million years ago)
• Formation: Inferior Oolite Formation
• Locality: Milborne Wick, Dorset, United Kingdom
• Provenance: From the Alice Purnell Collection
• Preservation: Excellent – detailed ribbing, coiling, and natural matrix contrast
• Colour: Natural beige to light brown fossil tones
• Size: See photo – scale cube shows 1cm squares
• Condition: 100% natural; no restoration
• Specimen: The exact item shown in the photos is the one you will receive

Authenticity Guarantee:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. This Caumontisphinctes polygyralis ammonite is professionally curated from the Alice Purnell Collection, ensuring scientific provenance, authenticity, and exceptional quality.

Shipping & Packaging:

Your specimen will be carefully packaged and shipped with full tracking. A rare and scientifically valuable addition for fossil collectors, educators, museums, or as a timeless gift for lovers of natural history.

Thank you for visiting our shop — explore our full selection of genuine fossils, minerals, and natural treasures from around the world!