Description
Offered here is a striking Polymorphites polymorphus ammonite fossil multi block, collected from the renowned fossil beds of Yorkshire, United Kingdom. This specimen originates from the Lower Sinemurian stage of the Jurassic Period, dating to approximately 196–190 million years ago.
The actual fossil block shown is the exact item you will receive. It is a natural multi-ammonite cluster, carefully chosen for both its aesthetic composition and paleontological value, making it an exceptional specimen for collectors, educators, or anyone with a fascination for Earth’s prehistoric oceans.
Geological & Palaeontological Details:
- Species: Polymorphites polymorphus
- Fossil Type: Multiple ammonites in matrix (fossil multi block)
- Family: Echioceratidae
- Superfamily: Psiloceratoidea
- Order: Ammonitida
- Geological Period: Jurassic
- Stage: Lower Sinemurian
- Location: Yorkshire, UK
- Stratigraphy/Biozone: Likely within the Semicostatum Zone, a common stratigraphic interval for early Sinemurian ammonites in the Yorkshire area
- Depositional Environment: Formed in a shallow marine shelf setting typical of the Cleveland Basin, where fine silts and muds allowed for exceptional fossil preservation
Morphology & Features:
- Polymorphites polymorphus typically exhibits evolute coiling with narrow whorls and fine, sharp ribbing
- Whorl cross-sections are compressed, giving the shell a streamlined appearance
- This block includes multiple ammonite specimens of varying sizes, providing a rich visual and scientific insight into Sinemurian fauna
- Excellent contrast between fossil and matrix enhances display quality
Notability: Polymorphites polymorphus is a representative ammonite of the Lower Sinemurian and provides valuable information for biostratigraphic correlation and environmental interpretation of early Jurassic marine settings in Britain. Multi-fossil blocks such as this are rare and prized by collectors for their dynamic presentation and completeness.
Additional Details:
- All our fossils are 100% genuine specimens
- Includes a Certificate of Authenticity
- Photo shows the exact fossil you will receive
- Scale cube = 1cm – please refer to images for full size reference
An excellent display piece and educational resource, this fossil brings the story of ancient Jurassic seas to life. Own a unique, museum-quality window into deep time from one of England’s most famous fossil localities!
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