Description
Offered here is a RARE and impressive 10-inch ammonite fossil of the genus Gravesia, from the Upper Tithonian (Portlandian) stage, straddling the Jurassic–Cretaceous boundary. This stunning specimen was discovered in Lorraine, France, a region renowned for yielding some of the best-preserved ammonites from this critical geological period.
You will receive the exact specimen shown in the photo, which includes a 1cm cube for scale—please refer to the image for full sizing. This is a 100% genuine fossil, carefully selected by experts and accompanied by a Certificate of Authenticity.
Geological & Scientific Information:
- Genus: Gravesia
- Type: Fossil Ammonite (extinct marine cephalopod)
- Size: Approximately 10 inches (see scale in image)
- Geological Period: Cretaceous (transition from Jurassic)
- Stage: Upper Tithonian (Portlandian)
- Age: Approx. 150–145 million years old
- Location Found: Lorraine, France
- Order: Ammonitida
- Superfamily: Perisphinctoidea
- Family: Neocomitidae
- Morphological Features: Gravesia species are characterised by moderately involute shells with dense, bifurcating ribbing and a slightly compressed whorl section. This specimen showcases sharp ribbing, clear whorl exposure, and an impressive overall form.
- Depositional Environment: Shallow epicontinental seas with fine calcareous sediments, contributing to excellent fossil preservation in the Lorraine region. These marine settings supported diverse cephalopod life during the latest Jurassic and earliest Cretaceous.
- Biozone Relevance: Gravesia is a key genus in Upper Tithonian ammonite biozones, used to correlate strata across Western Europe. It serves as an important index fossil for the Portlandian stage.
Additional Notes:
This Gravesia specimen comes from a significant geological boundary and represents a transitional form between classic Jurassic ammonites and early Cretaceous faunas. Its size, preservation, and rarity make it an outstanding addition to any fossil collection.
Why Buy From Us?
- All fossils are authentic and professionally selected.
- Each item comes with a Certificate of Authenticity.
- The exact item shown is the one you will receive.
- Perfect for collectors, educators, museums, or display.
Add this rare and beautifully preserved 10″ Gravesia ammonite to your collection and own a piece of Earth’s evolutionary history at the Jurassic-Cretaceous boundary!
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