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RARE 6.5" Acanthoceras rhotomagense Fossil Ammonite, Lower Cenomanian Cretaceous, SUSSEX UK – Authentic with COA
RARE 6.5" Acanthoceras rhotomagense Fossil Ammonite, Lower Cenomanian Cretaceous, SUSSEX UK – Authentic with COA - Image 2

RARE 6.5″ Acanthoceras rhotomagense Fossil Ammonite, Lower Cenomanian Cretaceous, SUSSEX UK – Authentic with COA

£36.00

This listing features a RARE 6.5″ Acanthoceras rhotomagense fossil ammonite, a beautifully preserved example from the Lower Cenomanian Stage of the Cretaceous Period, collected from Sussex, United Kingdom.

This is the actual fossil specimen you will receive, shown photographed with a 1cm scale cube for accurate sizing.

Taxonomic Details:

  • Genus: Acanthoceras
  • Species: rhotomagense
  • Order: Ammonitida
  • Superfamily: Acanthoceratoidea
  • Family: Acanthoceratidae
  • Originally described by d’Orbigny in 1841

Geological and Stratigraphic Context:

  • Period: Cretaceous
  • Stage: Lower Cenomanian
  • Age: Approx. 100.5 to 96 million years ago
  • Locality: Sussex, United Kingdom
  • Formation: Typically derived from the Chalk Marl or underlying grey marl seams associated with the basal Cenomanian transgression
  • Depositional Environment: Shallow marine epicontinental sea, part of the Anglo-Paris Basin, rich in nektonic and planktonic organisms
  • Biozone: Associated with Mantelliceras mantelli and Acanthoceras rhotomagense ammonite zones, marking early Cenomanian biostratigraphy

Morphological Features:

  • Large, robust ammonite with strong radial ribbing
  • Presence of tubercles (spine bases) along the ribs, especially near the shoulder
  • Evolute coiling with a broad, open umbilicus
  • Ornate and sculpted shell structure, typical of Acanthoceras

Scientific Significance:

  • Acanthoceras rhotomagense is widely used as a biostratigraphic marker for early Cenomanian strata in Europe
  • The genus is an important evolutionary benchmark within the Acanthoceratidae lineage, showing development of defensive ornamentation and hydrodynamic shell forms

Authenticity & Display: This fossil is a 100% genuine natural specimen and comes with a Certificate of Authenticity. It is a highly desirable piece for fossil collectors, museum enthusiasts, academic study, or natural history display.

Photos show the actual fossil being offered. A carefully chosen piece, well-preserved and representative of its species.

Please review the images for full sizing and condition. Don’t miss this chance to own a fine Cretaceous ammonite from Sussex, showcasing the splendor of England’s ancient marine ecosystems.

(Actual as seen)

Only 1 left in stock

SKU: UF3858 Category:

Description

This listing features a RARE 6.5″ Acanthoceras rhotomagense fossil ammonite, a beautifully preserved example from the Lower Cenomanian Stage of the Cretaceous Period, collected from Sussex, United Kingdom.

This is the actual fossil specimen you will receive, shown photographed with a 1cm scale cube for accurate sizing.

Taxonomic Details:

  • Genus: Acanthoceras
  • Species: rhotomagense
  • Order: Ammonitida
  • Superfamily: Acanthoceratoidea
  • Family: Acanthoceratidae
  • Originally described by d’Orbigny in 1841

Geological and Stratigraphic Context:

  • Period: Cretaceous
  • Stage: Lower Cenomanian
  • Age: Approx. 100.5 to 96 million years ago
  • Locality: Sussex, United Kingdom
  • Formation: Typically derived from the Chalk Marl or underlying grey marl seams associated with the basal Cenomanian transgression
  • Depositional Environment: Shallow marine epicontinental sea, part of the Anglo-Paris Basin, rich in nektonic and planktonic organisms
  • Biozone: Associated with Mantelliceras mantelli and Acanthoceras rhotomagense ammonite zones, marking early Cenomanian biostratigraphy

Morphological Features:

  • Large, robust ammonite with strong radial ribbing
  • Presence of tubercles (spine bases) along the ribs, especially near the shoulder
  • Evolute coiling with a broad, open umbilicus
  • Ornate and sculpted shell structure, typical of Acanthoceras

Scientific Significance:

  • Acanthoceras rhotomagense is widely used as a biostratigraphic marker for early Cenomanian strata in Europe
  • The genus is an important evolutionary benchmark within the Acanthoceratidae lineage, showing development of defensive ornamentation and hydrodynamic shell forms

Authenticity & Display: This fossil is a 100% genuine natural specimen and comes with a Certificate of Authenticity. It is a highly desirable piece for fossil collectors, museum enthusiasts, academic study, or natural history display.

Photos show the actual fossil being offered. A carefully chosen piece, well-preserved and representative of its species.

Please review the images for full sizing and condition. Don’t miss this chance to own a fine Cretaceous ammonite from Sussex, showcasing the splendor of England’s ancient marine ecosystems.

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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