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RARE Garantiana densicostata Fossil Ammonite – Upper Bajocian, Jurassic, Eurecy Calvados France – Genuine + COA
RARE Garantiana densicostata Fossil Ammonite – Upper Bajocian, Jurassic, Eurecy Calvados France – Genuine + COA - Image 2

RARE Garantiana densicostata Fossil Ammonite – Upper Bajocian, Jurassic, Eurecy Calvados France – Genuine + COA

£24.00

A rare and finely preserved Garantiana densicostata Fossil Ammonite, from the Upper Bajocian Stage of the Jurassic Period, discovered near Eurecy, Calvados, Normandy, France. This ammonite displays classic features of the genus Garantiana, with tightly packed ribbing and well-preserved details. The exact specimen shown in the photo is the one you will receive and includes a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Species: Garantiana densicostata
  • 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: Garantiana Zone – a key ammonite biozone used for Middle Jurassic biostratigraphy across NW Europe
  • Depositional Environment: Shallow marine platform with fine calcareous muds and marls – ideal for ammonite preservation

Locality:

  • Region: Eurecy, Calvados, Normandy, France
  • Formation: Likely from Bajocian limestone and marl units of the Paris Basin sequence (exact formation unconfirmed)

Morphology & Features:

  • Tightly coiled evolute shell with a wide umbilicus
  • Very dense, fine ribbing characteristic of densicostata species
  • Ribs bifurcate low on the flanks and continue smoothly across the venter
  • Rounded whorl section and consistent rib patterning

Scientific Notes:

  • Garantiana densicostata was first described in the 19th century and is a key faunal indicator for high-resolution stratigraphic studies
  • Often used in correlating Middle Jurassic sequences across France, England, and Germany

Notable Details:

  • A rare and visually striking ammonite specimen
  • Natural and unrestored; professionally cleaned and prepped
  • Scale Reference: Each square or cube in the image = 1cm. Please refer to the image for precise measurements

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

 

This rare Garantiana densicostata ammonite is ideal for collectors, educators, or anyone interested in Jurassic palaeontology. A striking piece of natural history from the marine ecosystems of ancient Normandy.

 

(Actual as seen)

Only 1 left in stock

SKU: UF4268 Category:

Description

A rare and finely preserved Garantiana densicostata Fossil Ammonite, from the Upper Bajocian Stage of the Jurassic Period, discovered near Eurecy, Calvados, Normandy, France. This ammonite displays classic features of the genus Garantiana, with tightly packed ribbing and well-preserved details. The exact specimen shown in the photo is the one you will receive and includes a Certificate of Authenticity.

Fossil Type & Species:

  • Type: Ammonite (extinct marine cephalopod)
  • Species: Garantiana densicostata
  • 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: Garantiana Zone – a key ammonite biozone used for Middle Jurassic biostratigraphy across NW Europe
  • Depositional Environment: Shallow marine platform with fine calcareous muds and marls – ideal for ammonite preservation

Locality:

  • Region: Eurecy, Calvados, Normandy, France
  • Formation: Likely from Bajocian limestone and marl units of the Paris Basin sequence (exact formation unconfirmed)

Morphology & Features:

  • Tightly coiled evolute shell with a wide umbilicus
  • Very dense, fine ribbing characteristic of densicostata species
  • Ribs bifurcate low on the flanks and continue smoothly across the venter
  • Rounded whorl section and consistent rib patterning

Scientific Notes:

  • Garantiana densicostata was first described in the 19th century and is a key faunal indicator for high-resolution stratigraphic studies
  • Often used in correlating Middle Jurassic sequences across France, England, and Germany

Notable Details:

  • A rare and visually striking ammonite specimen
  • Natural and unrestored; professionally cleaned and prepped
  • Scale Reference: Each square or cube in the image = 1cm. Please refer to the image for precise measurements

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

 

This rare Garantiana densicostata ammonite is ideal for collectors, educators, or anyone interested in Jurassic palaeontology. A striking piece of natural history from the marine ecosystems of ancient Normandy.

 

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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