RARE Pseudarisphinctes damoni Fossil Ammonite | Oxfordian | Jurassic Chittering UK | Certified | Ampthill Clay Formation

Description

This listing presents a RARE Pseudarisphinctes damoni fossil ammonite, a finely preserved specimen from the Oxfordian Stage of the Jurassic Period, collected from the Ampthill Clay Formation in Chittering, United Kingdom. The fossil is a carefully selected example, with the exact piece shown in the listing photo.

Geological Context:

• Fossil Type: Ammonite (extinct marine cephalopod)
• Species: Pseudarisphinctes damoni
• Geological Period: Jurassic
• Geological Stage: Oxfordian (Upper Jurassic)
• Formation: Ampthill Clay Formation
• Location: Chittering, Cambridgeshire, United Kingdom
• Depositional Environment: Offshore marine muds in a quiet, low-energy marine shelf setting rich in fine sedimentation

Scientific Classification:

• Order: Ammonitida
• Superfamily: Perisphinctoidea
• Family: Perisphinctidae

Morphology & Notable Features:

• Pseudarisphinctes damoni is recognised by its evolute coiling and well-marked bifurcating ribs, with a shell exhibiting moderate whorl expansion.
• It represents a transitional form within Oxfordian ammonite biozones and offers insight into the evolutionary diversification of perisphinctids.
• This specimen shows excellent preservation, maintaining detailed surface ornamentation characteristic of the species.

Palaeontological Significance:

• The genus Pseudarisphinctes is important for biostratigraphic zonation within the Oxfordian, contributing to the understanding of late Jurassic marine faunal assemblages in Europe.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Scale Rule Squares / Cube = 1cm: Full sizing please see photo. The Fossil is a carefully chosen piece, with a photo that shows the actual specimen you will receive.