Description
An exceptional and rare Orthogarantiana Fossil Ammonite from the Bajocian Stage of the Middle Jurassic, collected in Belgium. This finely preserved ammonite is a scientifically notable and visually impressive example of early Jurassic ammonoid diversity. It comes with a Certificate of Authenticity, and the exact specimen shown in the photo is the one you will receive.
Fossil Type & Species:
- Type: Ammonite (extinct marine cephalopod)
- Genus: Orthogarantiana (exact species not specified)
- Order: Ammonitida
- Superfamily: Stephanoceratoidea
- Family: Stephanoceratidae
Geological Context:
- Period: Jurassic
- Epoch/Stage: Middle Jurassic – Bajocian Stage (approx. 170.3 to 168.3 million years ago)
- Biozone (likely): Possibly within the Garantiana or Parkinsoni zones (common zones associated with this genus)
- Depositional Environment: Shallow epicontinental marine platform – typically calcareous mudstones and marls, favourable to ammonite preservation
Locality:
- Region: Belgium (specific quarry or lithostratigraphy not provided)
Morphology & Features:
- Moderately involute shell with well-developed, gently curved primary ribs
- Slightly compressed whorl section with fine ornamentation along the flanks
- A diagnostic feature of Orthogarantiana includes less pronounced tuberculation compared to its relative Garantiana
- Graceful ribbing that bifurcates near the umbilicus and travels smoothly across the flanks to the venter
Scientific Notes:
- Orthogarantiana is considered a transitional genus between earlier forms and later highly ribbed Stephanoceratids
- Rarely found in complete and well-preserved condition, making this specimen an excellent addition to both scientific and private collections
- Described and revised in various European Jurassic biostratigraphic studies – often used for Middle Jurassic ammonite correlation
Notable Details:
- The fossil is in very good condition and displays key diagnostic features
- Fossil is unaltered and naturally preserved, with no restoration or composite parts
- Scale Rule / Cube: 1cm per square or cube; please see the photo for full dimensions
Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and supplied with a Certificate of Authenticity. The photo shows the exact item you will receive.
Whether for scientific study, display, or as a unique gift for a fossil enthusiast, this Orthogarantiana ammonite offers a glimpse into the marine ecosystems of the Jurassic seas of Europe.
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