Rare Fossil Heteromorph Uncoiled Ammonite (Turrilites desmoyersi) – Lower Cenomanian, Upper Cretaceous, Beachy Head Sussex UK

Description

A rare heteromorph uncoiled ammonite (Turrilites desmoyersi), from the Lower Cenomanian Stage of the Upper Cretaceous, collected at Beachy Head, Sussex, United Kingdom. This specimen is highly collectable, displaying the distinctive helically uncoiled morphology of Turrilites. The fossil pictured is the exact one you will receive, and it is supplied with a Certificate of Authenticity.

Fossil Type & Species:

• Type: Heteromorph Ammonite (extinct marine cephalopod)
• Species: Turrilites desmoyersi
• Order: Ammonitida
• Superfamily: Turrilitoidea
• Family: Turrilitidae

Geological Context:

• Period: Cretaceous
• Epoch/Stage: Upper Cretaceous – Lower Cenomanian (approx. 100.5 to 97 million years ago)
• Biozone: Commonly associated with Mantelliceras mantelli and Cunningtoniceras inerme ammonite faunas of the Lower Cenomanian
• Formation: Chalk deposits of the Cenomanian stage (White Chalk Subgroup, southern England)
• Depositional Environment: Shallow marine chalk seas with calcareous sedimentation, ideal for fossil preservation

Locality:

• Region: Beachy Head, Sussex, United Kingdom

Morphology & Features:

• Helically uncoiled and turreted shell form characteristic of Turrilites
• Fine ribbing and ornamentation extending along the spiral whorls
• Distinctive morphology differing from regularly coiled ammonites, adding rarity and display appeal
• Excellent preservation with strong structural definition

Scientific Notes:

• Turrilites desmoyersi is one of the most recognisable Cenomanian heteromorph ammonites
• First formally described in the 19th century, it remains a key index species in Lower Cenomanian biostratigraphy across Europe

Notable Details:

• Rare British heteromorph ammonite from the famous White Chalk cliffs of Sussex
• Excellent preservation, highlighting ribbing and turreted morphology
• 100% genuine, natural fossil – no restoration
• Scale Reference: Each square or cube = 1cm. Please see photographs for accurate sizing

Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and professionally curated. Each specimen is supplied with a Certificate of Authenticity. The fossil pictured is the exact one you will receive.

This Turrilites desmoyersi ammonite is a rare and scientifically valuable fossil from the Lower Cenomanian of Sussex – an excellent addition for collectors, researchers, or natural history displays.