Procerozigzag crassizigzag Ammonite Fossil | Lower Callovian, Jurassic | Ashton Keynes UK | Alice Purnell Collection

Description

Fossil Type & Species:

This listing features a genuine ammonite fossil of Procerozigzag crassizigzag, a rare and highly detailed species from the Lower Callovian Stage of the Jurassic Period. Collected from the historically significant locality of Ashton Keynes, Wiltshire, United Kingdom, this fossil is part of the esteemed Alice Purnell Collection, ensuring both authenticity and excellent preservation.

Geological Formation & Insight:

Procerozigzag belongs to the zigzag-patterned ammonite groups of the Jurassic, known for their distinctive, often coarse ribbing and strongly involute shell forms. The species crassizigzag is particularly notable for its thickened ribbing and precise stratigraphic placement within the Lower Callovian.

These ammonites were nektonic marine cephalopods, active swimmers in shallow Jurassic seas that covered much of Europe during the Middle Jurassic (~166–163 million years ago). The fossil-bearing strata in Ashton Keynes are part of the Oxford Clay Formation, one of Britain’s most productive marine fossil units.

The fine clays and silts of the Oxford Clay formed in low-energy, offshore marine environments, which helped preserve delicate features of ammonite shells — such as suture lines and ribbing — in remarkable detail.

Item Specifics:

• Fossil Type: Ammonite
• Species: Procerozigzag crassizigzag
• Geological Age: Lower Callovian, Middle Jurassic (~166–163 million years ago)
• Formation: Oxford Clay Formation
• Locality: Ashton Keynes, Wiltshire, United Kingdom
• Provenance: From the Alice Purnell Collection
• Preservation: Excellent – clear ribbing and shell coiling detail
• Colour: Typically grey-brown fossil in contrasting natural matrix
• Size: See photo – scale rule/cube = 1cm
• Condition: 100% natural, unrestored
• Specimen: You will receive the exact item shown in the photograph

Authenticity Guarantee:

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity. This ammonite fossil comes from the respected Alice Purnell Collection, offering traceable provenance and professional curation.

Shipping & Packaging:

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

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