Description
This listing features a RARE 9″ Coroniceras lyra fossil ammonite, a striking specimen from the Sinemurian Stage of the Lower Jurassic, discovered on the Yorkshire Coast, United Kingdom. This exceptionally preserved fossil showcases the iconic features of the species Coroniceras lyra, an early ammonite belonging to the family Arietitidae and the superfamily Eoderoceratoidea.
Geological Context:
- Fossil Type: Ammonite (extinct marine cephalopod)
- Species: Coroniceras lyra
- Stage: Sinemurian (Lower Jurassic, approx. 199–190 million years ago)
- Location: Yorkshire Coast, UK
- Depositional Environment: Shallow marine shelf, rich in marine life, indicating open marine conditions with good oxygenation and sedimentation conducive to fossil preservation.
Scientific Classification:
- Order: Ammonitida
- Superfamily: Eoderoceratoidea
- Family: Arietitidae
Morphology & Notable Features:
- This large 9-inch ammonite is distinguished by its deeply ribbed shell, with the ribs radiating from the umbilicus and sweeping across the flanks to the venter.
- The whorls are involute with a well-defined keel and sharp ribbing, typical of Coroniceras lyra.
- This specimen displays excellent three-dimensional preservation with minimal distortion, making it both scientifically valuable and highly collectible.
Palaeontological Significance:
Coroniceras lyra is an important index fossil for the Sinemurian Stage, often used in correlating rock layers in Northern Europe. Its distinctive morphology and size make it one of the more recognisable and desirable Lower Jurassic ammonites.
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 pictured is the exact specimen you will receive—carefully selected for its quality and rarity.
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