Description
This listing features a VERY RARE fossil specimen of the heteromorph ammonite Spiroceras bifurcati, discovered by our expert field team, Alister and Alison, on 30 April 2025 at Burton Bradstock, along the internationally recognised Jurassic Coast, Dorset, UK.
The fossil originates from the Inferior Oolite Formation, part of the Bajocian Stage of the Middle Jurassic (~170 million years ago). Spiroceras is a highly unusual ammonite genus due to its heteromorph coiling pattern—the shell does not coil in a regular spiral but instead shows a partially uncoiled, irregular or spiral form. This unique morphology makes it an exceptional and highly sought-after specimen.
Scientific and geological context:
- Order: Ammonitida
- Superfamily: Stephanoceratoidea
- Family: Possibly Tulitidae (classification debated)
- Genus & Species: Spiroceras bifurcati
- Morphology Features: Bifurcating ribbing, heteromorphic shell with open, loosely coiled whorls
- Geological Stage: Bajocian
- Depositional Environment: Shallow marine shelf with oolitic sedimentation typical of the Inferior Oolite
The fossil has been professionally cleaned, prepped, and treated by Alison, preserving its rare and delicate form. The photo provided is of the actual specimen you will receive, and includes a 1cm scale cube for accurate sizing—please refer to the photo for full measurements.
All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity (COA), confirming provenance and scientific identity.
This is a highly collectable and visually striking piece, ideal for fossil enthusiasts, advanced collectors, museums, or educational institutions looking to showcase rare Jurassic marine life.
Origin: Burton Bradstock, Dorset, United Kingdom
Formation: Inferior Oolite
Age: Bajocian Stage, Middle Jurassic (~170 Ma)
Species: Spiroceras bifurcati
Discovered by: Alister and Alison (30 April 2025)
Prepared by: Alison
Authenticity: 100% Genuine Fossil with COA
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