Description
Offered here is a RARE Chalk Fossil Ammonite of the species Cunningtoniceras inerme, from the Middle Cenomanian Stage of the Cretaceous Period. This remarkable specimen was discovered in Glynde, Sussex, United Kingdom, and originates from the prestigious Alice Purnell Collection, known for its scientifically significant and well-documented specimens.
Geological Details:
- Locality: Glynde, Sussex, UK
- Geological Period: Cretaceous
- Geological Stage: Middle Cenomanian (~96 to 94 million years ago)
- Depositional Environment: Shallow, warm epicontinental chalk sea; low-energy carbonate setting rich in planktonic organisms
- Formation: Lower Chalk or equivalent Middle Cenomanian chalk beds of Southern England
Paleontological Context: Cunningtoniceras inerme is a species within the Acanthoceratidae Family, a group of heteromorph and planispiral ammonites. This species is used in biostratigraphy and helps define ammonite zones in Cenomanian sequences of Europe. It is a distinctive member of the Cunningtoniceras genus, known for its smooth morphology compared to other more ornamented relatives.
- Order: Ammonitida
- Superfamily: Acanthoceratoidea
- Family: Acanthoceratidae
- Genus: Cunningtoniceras
- Species: inerme
- Zone/Biozone: Middle Cenomanian, associated with the Acanthoceras rhotomagense Zone
- Formally Described by: Klinger & Kennedy, 1979
Morphological Features:
- Involute and compressed shell form
- Almost smooth (inermis) flanks, with faint ribbing in early whorls
- Rounded venter (outer shell edge)
- Characteristic of lower chalk matrix preservation with pale to off-white colour
Notable Characteristics:
- Rare British occurrence of a species more commonly found in continental Europe and North Africa
- Fine preservation in soft chalk matrix
- Provenance from the well-regarded Alice Purnell Collection ensures quality and traceability
Authenticity & Presentation:
- 100% genuine fossil, not a replica
- Comes with a Certificate of Authenticity
- Photographed specimen is the exact one you will receive
- Scale cube = 1cm – see photo for full size reference
Additional Notes: This is a superb and rare opportunity to acquire a scientifically valuable and aesthetically appealing ammonite from the classic English chalk. The smooth morphology of Cunningtoniceras inerme contrasts beautifully with more ornate ammonites and reflects unique evolutionary adaptations within mid-Cretaceous seas. A standout addition for any collector of Cretaceous or UK marine fossils.
All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.
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