RARE Orthogarantiana schroederi Fossil Ammonite – Upper Bajocian, Jurassic, Normandy France – Genuine + COA

Description

A rare and beautifully preserved Orthogarantiana schroederi Fossil Ammonite, from the Upper Bajocian Stage of the Jurassic Period, discovered in Normandy, France. This exceptional specimen exemplifies the fine ribbing and unique structure typical of the genus and is supplied with a Certificate of Authenticity. The specimen shown in the photo is the exact item you will receive.

Fossil Type & Species:

• Type: Ammonite (extinct marine cephalopod)
• Species: Orthogarantiana schroederi
• Order: Ammonitida
• Superfamily: Stephanoceratoidea
• Family: Stephanoceratidae

Geological Context:

• Period: Jurassic
• Epoch/Stage: Middle Jurassic – Upper Bajocian (approx. 170.3 to 168.3 million years ago)
• Biozone: Likely from the Garantiana Zone, with Orthogarantiana representing a transitional or derived form
• Depositional Environment: Shallow marine platform with calcareous muds and marls, supporting rich ammonite faunas

Locality:

• Region: Normandy, France
• Formation: Bajocian limestone-marl sequences of the Paris Basin (specific formation not confirmed)

Morphology & Features:

• Evolute shell with a wide umbilicus
• Fine, dense ribbing that bifurcates low on the flanks
• Flat flanks and rounded venter with uninterrupted rib continuation
• Subtle ornamentation and symmetry distinguish it from closely related genera

Scientific Notes:

• Orthogarantiana schroederi is an important marker in certain regional stratigraphic frameworks and helps refine zonal schemes in NW Europe
• This species is less frequently encountered than other Garantianids, increasing its desirability to collectors

Notable Details:

• Excellent preservation with well-defined ribs and whorl structure
• 100% natural with no restoration or composites
• Scale Reference: Each square or cube = 1cm. Please refer to the image for accurate sizing

Authenticity & Guarantee: All of our fossils are 100% genuine, responsibly sourced, and include a Certificate of Authenticity. The fossil pictured is the exact one you will receive.

This Orthogarantiana schroederi ammonite is a rare and scientifically valuable specimen – perfect for fossil collectors, educational use, or natural history display.