Description
This listing features a RARE and impressive 9-inch Fossil Ammonite – Passendorferia birmensdorfensis, an exceptional specimen from the Oxfordian Stage of the Upper Jurassic, discovered in Charente-Maritime, France. With its large size and distinctive ribbing, this ammonite is a striking piece of natural history and an important addition to any fossil collection.
All our fossils are 100% genuine specimens and come with a Certificate of Authenticity. The exact specimen shown in the photographs is the one you will receive. Please refer to the scale cube in the photo (1cm squares) for full sizing.
Fossil Overview:
- Species: Passendorferia birmensdorfensis (Geczy, 1966)
- Type: Fossil Ammonite
- Geological Period: Jurassic
- Stage: Oxfordian (~163.5 – 157.3 million years ago)
- Location: Charente-Maritime, France
- Specimen Size: Approx. 9 inches (22.5 cm)
- Preservation: Natural fossil, often found in limestone or marly matrix
Geological & Depositional Environment:
The Oxfordian Stage of the Upper Jurassic was marked by warm, shallow marine conditions across much of what is now western Europe. The region of Charente-Maritime in southwestern France is renowned for its richly fossiliferous Jurassic formations, including limestones and marls laid down in low-energy, open-marine shelf environments.
These environments allowed for the exquisite preservation of ammonites, bivalves, gastropods, and echinoderms. Passendorferia birmensdorfensis is characteristic of the ammonite fauna from this time and region.
Taxonomy & Classification:
- Phylum: Mollusca
- Class: Cephalopoda
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Perisphinctidae
- Genus: Passendorferia
- Species: P. birmensdorfensis (described by Geczy in 1966)
Morphological Features:
This species is distinguished by:
- A moderately involute, evolute coiled shell
- Prominent, bifurcating ribs crossing the whorls
- A rounded, compressed whorl section
- Deep umbilicus and strong ventral keel in some individuals
These features suggest it was a fast-swimming, nektonic predator in the Jurassic seas, using jet propulsion like modern cephalopods.
Notable Points:
- Large and rare specimen at 9 inches
- Excellent preservation of shell form and ribbing
- From a highly fossiliferous Oxfordian deposit in France
- Identified and described by palaeontologist Béla Géczy in 1966
- Valuable both for display and biostratigraphic study
Why Buy From Us?
- All fossils are 100% genuine and responsibly sourced
- Includes a Certificate of Authenticity with every specimen
- The exact fossil pictured is the one you will receive
- Professional packaging and fast, secure shipping
Bring home a beautifully preserved relic of the Jurassic seas with this Passendorferia birmensdorfensis ammonite. A scientifically significant and visually impressive addition to any fossil or natural history collection.
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