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Rare Fossil Heteromorph Uncoiled Ammonite (Hypoturrilites mantelli) – Lower Cenomanian, Upper Cretaceous, Pitstone UK – Genuine + COA

£18.00

A rare heteromorph uncoiled ammonite (Hypoturrilites mantelli), from the Lower Cenomanian Stage of the Upper Cretaceous, collected at Pitstone, United Kingdom. This specimen is highly collectable, displaying the distinctive turreted and helically uncoiled morphology typical of Hypoturrilites. 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: Hypoturrilites mantelli
  • 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: Associated with Mantelliceras mantelli Zone, a key ammonite horizon 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, excellent for ammonite preservation

Locality:

  • Region: Pitstone, United Kingdom

Morphology & Features:

  • Helically turreted shell coiling upwards in a spiral, distinctive of heteromorph ammonites
  • Fine ribbing and ornamentation visible along the shell
  • Unusual uncoiled morphology that sets Hypoturrilites apart from other ammonite genera
  • Excellent preservation with detailed ornamentation

Scientific Notes:

  • Hypoturrilites mantelli was first described in the 19th century during systematic studies of British Cretaceous ammonites
  • It is widely used as an index species for biostratigraphy within the Lower Cenomanian
  • Its distinctive coiling represents evolutionary diversity among Cretaceous heteromorph ammonites

Notable Details:

  • Rare British heteromorph ammonite from a classic Cretaceous locality
  • Excellent preservation with strong ribbing and helically 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 Hypoturrilites mantelli ammonite is a rare and scientifically significant fossil from the Lower Cenomanian of Pitstone – an excellent addition for collectors, researchers, or natural history displays.

(Actual as seen)

Only 1 left in stock

SKU: UF4327 Category:

Description

A rare heteromorph uncoiled ammonite (Hypoturrilites mantelli), from the Lower Cenomanian Stage of the Upper Cretaceous, collected at Pitstone, United Kingdom. This specimen is highly collectable, displaying the distinctive turreted and helically uncoiled morphology typical of Hypoturrilites. 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: Hypoturrilites mantelli
  • 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: Associated with Mantelliceras mantelli Zone, a key ammonite horizon 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, excellent for ammonite preservation

Locality:

  • Region: Pitstone, United Kingdom

Morphology & Features:

  • Helically turreted shell coiling upwards in a spiral, distinctive of heteromorph ammonites
  • Fine ribbing and ornamentation visible along the shell
  • Unusual uncoiled morphology that sets Hypoturrilites apart from other ammonite genera
  • Excellent preservation with detailed ornamentation

Scientific Notes:

  • Hypoturrilites mantelli was first described in the 19th century during systematic studies of British Cretaceous ammonites
  • It is widely used as an index species for biostratigraphy within the Lower Cenomanian
  • Its distinctive coiling represents evolutionary diversity among Cretaceous heteromorph ammonites

Notable Details:

  • Rare British heteromorph ammonite from a classic Cretaceous locality
  • Excellent preservation with strong ribbing and helically 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 Hypoturrilites mantelli ammonite is a rare and scientifically significant fossil from the Lower Cenomanian of Pitstone – an excellent addition for collectors, researchers, or natural history displays.

Additional information

Era

Cretaceous

Origin

United Kingdom

Cretaceous Information

The Cretaceous Period (145–66 million years ago) was the final era of the Mesozoic, marked by the dominance of dinosaurs and the rise of flowering plants. It had a warm, greenhouse climate, with high sea levels that created vast shallow inland seas. Marine life flourished, including mosasaurs, ammonites, and rudist reefs, while the land was ruled by iconic dinosaurs like Tyrannosaurus rex, Triceratops, and Spinosaurus. Mammals and birds diversified, and insects thrived. The period ended with the mass extinction event, likely caused by an asteroid impact, wiping out the dinosaurs and paving the way for the rise of mammals in the Cenozoic.

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