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Rare Geyerina fasciata Fossil Ammonite | Bajocian Jurassic | Calvados France | Genuine Specimen with COA

Rare Geyerina fasciata Fossil Ammonite | Bajocian Jurassic | Calvados France | Genuine Specimen with COA

£12.60

This listing is for a Rare Fossil Ammonite (Geyerina fasciata) from the Bajocian Stage of the Middle Jurassic, discovered in Calvados, Normandy, France.

100% Genuine Fossil Specimen – All of our fossils are authentic and come with a Certificate of Authenticity.

Exact Specimen Shown – The photos provided are of the actual fossil you will receive.

Scale for Reference – Scale rule squares/cube = 1cm. Please see photos for full sizing.

 

Geological & Scientific Details:

  • Fossil Type: Ammonite (extinct marine mollusc, related to squid and octopus).
  • Species: Geyerina fasciata.
  • Order: Ammonitida.
  • Superfamily: Stephanoceratoidea.
  • Family: Stephanoceratidae.
  • Geological Period: Jurassic.
  • Stage/Age: Bajocian (approx. 170 – 168 million years ago).
  • Locality: Calvados, France.

 

Notable Features & Morphology:

  • Shell Form: Moderately involute with compressed to sub-rounded whorls.
  • Ribs: Strong, regular ribbing crossing the flanks, often bifurcating, typical of Geyerina.
  • Whorl Section: Slightly compressed, giving the ammonite a striking appearance.
  • Size: A rare, well-preserved specimen, highly desirable for collectors.

 

Depositional Environment:

During the Bajocian, the Calvados region was part of a shallow marine environment with carbonate-rich sediments. The limestone and marl deposits preserved ammonites in exceptional detail, making them important for palaeontological study.

 

Scientific & Collecting Importance:

Geyerina fasciata is an important ammonite species for biostratigraphic correlation in the Bajocian. Its diagnostic ribbing and shell form make it valuable both for identifying Jurassic strata and as a collector’s piece.

 

Why Buy This Fossil?

  • A rare ammonite species from the Bajocian of Calvados, France.
  • Excellent preservation with strong ribbing.
  • A highly desirable specimen for collectors of Jurassic ammonites or European fossil material.
  • Supplied with a Certificate of Authenticity guaranteeing its provenance.

 

All of our fossils are responsibly sourced, carefully prepared, and chosen for quality.

(Actual as seen)

Only 1 left in stock

SKU: UF4350 Category:

Description

This listing is for a Rare Fossil Ammonite (Geyerina fasciata) from the Bajocian Stage of the Middle Jurassic, discovered in Calvados, Normandy, France.

100% Genuine Fossil Specimen – All of our fossils are authentic and come with a Certificate of Authenticity.

Exact Specimen Shown – The photos provided are of the actual fossil you will receive.

Scale for Reference – Scale rule squares/cube = 1cm. Please see photos for full sizing.

 

Geological & Scientific Details:

  • Fossil Type: Ammonite (extinct marine mollusc, related to squid and octopus).
  • Species: Geyerina fasciata.
  • Order: Ammonitida.
  • Superfamily: Stephanoceratoidea.
  • Family: Stephanoceratidae.
  • Geological Period: Jurassic.
  • Stage/Age: Bajocian (approx. 170 – 168 million years ago).
  • Locality: Calvados, France.

 

Notable Features & Morphology:

  • Shell Form: Moderately involute with compressed to sub-rounded whorls.
  • Ribs: Strong, regular ribbing crossing the flanks, often bifurcating, typical of Geyerina.
  • Whorl Section: Slightly compressed, giving the ammonite a striking appearance.
  • Size: A rare, well-preserved specimen, highly desirable for collectors.

 

Depositional Environment:

During the Bajocian, the Calvados region was part of a shallow marine environment with carbonate-rich sediments. The limestone and marl deposits preserved ammonites in exceptional detail, making them important for palaeontological study.

 

Scientific & Collecting Importance:

Geyerina fasciata is an important ammonite species for biostratigraphic correlation in the Bajocian. Its diagnostic ribbing and shell form make it valuable both for identifying Jurassic strata and as a collector’s piece.

 

Why Buy This Fossil?

  • A rare ammonite species from the Bajocian of Calvados, France.
  • Excellent preservation with strong ribbing.
  • A highly desirable specimen for collectors of Jurassic ammonites or European fossil material.
  • Supplied with a Certificate of Authenticity guaranteeing its provenance.

 

All of our fossils are responsibly sourced, carefully prepared, and chosen for quality.

Additional information

Era

Jurassic
Origin

France

Jurassic Information

The Jurassic Period (201–145 million years ago) was the golden age of dinosaurs, with iconic species like Brachiosaurus, Stegosaurus, and Allosaurus dominating the land. It was a time of warm, humid climates, with high sea levels that created vast shallow seas, supporting abundant marine reptiles, ammonites, and early coral reefs. The first birds, such as Archaeopteryx, evolved from small theropod dinosaurs, while early mammals remained small and nocturnal. Lush forests of cycads, conifers, and ferns covered the land, providing food for giant herbivores. The breakup of the supercontinent Pangaea accelerated, shaping Earth's geography and setting the stage for the diverse ecosystems of the Cretaceous.

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