Description
Offering a RARE Guerangeria fossil ammonite from the Cenomanian stage of the Cretaceous period, found in the fossiliferous chalk beds of Pavilly, Normandy, France.
Guerangeria is a genus of heteromorph ammonites known for its loosely coiled shell form and unusual morphology compared to the more tightly coiled typical ammonites. These fossils are excellent examples of evolutionary experimentation within cephalopods during the Late Cretaceous.
This specimen exhibits key characteristics of the genus including open planispiral coiling and faint ribbing along the shell, offering both aesthetic appeal and scientific value.
You will receive the exact specimen shown in the photo, and the scale cube (1cm squares) offers a precise size reference. As always, all of our fossils are 100% genuine specimens and come with a Certificate of Authenticity.
Geological & Scientific Information:
- Genus: Guerangeria
- Type: Fossil Ammonite (extinct marine cephalopod mollusc)
- Geological Period: Cretaceous
- Stage: Cenomanian (approx. 100.5 – 93.9 million years ago)
- Location Found: Pavilly, Seine-Maritime, Normandy, France
- Order: Ammonitida
- Superfamily: Turrilitoidea (tentative)
- Family: Likely affiliated with Anisoceratidae or related heteromorph families
- Morphological Features: Loosely coiled shell (heteromorph); planispiral with extended whorls; subtle ornamentation; narrow ribbing and possible constrictions
- Depositional Environment: Open marine chalk deposits of the Anglo-Paris Basin; indicative of a relatively deep and stable shelf sea during the highstand sea levels of the mid-Cretaceous
- Biozone Association: Cenomanian ammonite zones such as Mantelliceras mantelli or Calycoceras guerangeri may be associated, though precise biostratigraphic placement requires further locality details
- Scientific Significance: Guerangeria is an important representative of heteromorph ammonites and provides insight into the evolutionary diversification of ammonite shell forms during the Cretaceous
Additional Notes:
Due to their unusual morphology, Guerangeria fossils are highly sought after by both collectors and researchers. Specimens from Pavilly are particularly prized for their preservation within fine-grained chalk.
Why Buy From Us?
- Authentic fossils from verified and documented sources
- Each specimen comes with a Certificate of Authenticity
- Exact fossil shown is the one you will receive
- Carefully curated for scientific, educational, or display use
Add this exceptional Guerangeria ammonite fossil from France to your collection—an exquisite and rare piece of mid-Cretaceous marine life.
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