Rare Turrilites costatus Heteromorph Ammonite Fossil – Lower Cenomanian, Cretaceous – Glynde, United Kingdom – Alice Purnell Collection

Description

This listing features a rare Turrilites costatus heteromorph ammonite fossil from the Lower Cenomanian Stage of the Cretaceous Period, approximately 100.5 to 93.9 million years ago. It was discovered in Glynde, East Sussex, United Kingdom, and is part of the esteemed Alice Purnell Collection.

Turrilites costatus is a striking example of heteromorph ammonites, known for their tightly wound, turreted shells that deviate from the usual coiled planispiral shape of typical ammonites. Belonging to the family Turrilitidae, these ammonites possessed loosely coiled shells with pronounced ribbing that helped them drift through the shallow marine waters of the Late Cretaceous.

The Lower Cenomanian is the earliest subdivision of the Cenomanian Age, marking the beginning of the Late Cretaceous. During this time, much of southern England was covered by a warm shallow sea, forming the perfect environment for ammonites and other marine life to flourish. Fossils from this stage offer insight into the dynamic evolutionary transitions of marine fauna.

This beautifully preserved Turrilites costatus specimen displays the classic turreted form with strong ribbed ornamentation, characteristic of the species. Its rarity and well-defined features make it a prized piece for any collector, paleontologist, or fossil enthusiast.

Item Details:

• Species: Turrilites costatus
• Type: Heteromorph Ammonite Fossil
• Age: Lower Cenomanian, Cretaceous (approx. 100.5–93.9 million years ago)
• Geological Location: Glynde, East Sussex, United Kingdom
• Formation: Cretaceous Chalk Deposits
• Collection: Alice Purnell Collection
• Certificate of Authenticity: Included
• Scale Reference: Scale rule square/cube = 1cm. See photos for full sizing.

ACTUAL AS SEEN: The images show the exact specimen you will receive. Each fossil is carefully selected and professionally photographed. Sizes are accurate to the best possible extent, though slight variations may occur due to natural irregularities. Colours may vary depending on lighting conditions and screen calibration. Some fossils may be propped for photo purposes.

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A remarkable and rare example of Cretaceous marine life – own a unique heteromorph ammonite fossil from the chalk seas of southern England.