RARE Orthogarantiana Fossil Ammonite – Jurassic Bajocian, Belgium – Genuine Specimen + COA – Collectable Cephalopod

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.