Fossils for Sale - High-quality BRITISH and WORLDWIDE Fossils. An impressive selection of fossils, including Ammonites, Trilobites, Belemnites, Fossil Fish, Fossil Shark Teeth, Fossilised Insects in Amber, Dinosaurs, and Reptiles. UK Fossils was formed in 1988 and collects and preps our own fossils in the heart of the Jurassic Coast, collecting fossils from Lyme Regis, Charmouth and Somerset. Our passion for fossils is reflected in our carefully curated collection, which includes some of the rarest and most unique specimens available.

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RARE Cleviceras exaratum Fossil Ammonite Aalenian Jurassic France – Genuine Authentic Prehistoric Marine Cephalopod with Certificate

RARE Cleviceras exaratum Fossil Ammonite Aalenian Jurassic France – Genuine Authentic Prehistoric Marine Cephalopod with Certificate

Original price was: £36.00.Current price is: £30.60.

Rare Aalenian Fossil Ammonite from Calvados, France

This listing features a rare Cleviceras exaratum fossil ammonite from the Aalenian stage of the Middle Jurassic period, discovered in the renowned fossil-rich deposits of Calvados, Normandy, France. This superb specimen was carefully selected for its preservation, distinct morphological detail, and natural beauty. The photographs show the exact fossil you will receive, ensuring complete transparency and confidence in your purchase.

Geological Age & Formation

Cleviceras exaratum lived during the Aalenian stage, approximately 174.1 to 170.3 million years ago. This was a time when much of what is now northern France lay beneath shallow, temperate seas. These marine conditions provided an ideal environment for ammonites to flourish, and the fine-grained sediments that accumulated on the sea floor preserved their shells in remarkable detail. The Calvados region is especially well known for yielding ammonites of outstanding quality and scientific importance, making specimens from this area highly prized among collectors.

Species Identification & Morphology

Cleviceras exaratum belongs to the family Hildoceratidae within the superfamily Hildoceratoidea and order Ammonitida. It is easily recognised by its involute shell with narrow whorls, strong radial ribbing, and distinctive keel running along the venter. The ribs are relatively sharp and well-spaced, adding both structural strength and visual elegance to the shell. This species’ streamlined shape suggests adaptations for active swimming in the open water column, making it an efficient predator of small marine organisms. The suture lines, visible on this specimen, exhibit the complex folded patterns typical of advanced Jurassic ammonites.

Collector Highlights

  • Preservation: Crisp ribbing, well-defined keel, and clear suture patterns.
  • Authenticity: 100% genuine fossil, supplied with a Certificate of Authenticity.
  • Display Quality: Highly aesthetic specimen, perfect for cabinet display, teaching collections, or as a unique decorative piece.
  • Provenance: Sourced from the famous Calvados deposits in Normandy, France.
  • Rarity: Cleviceras exaratum from the Aalenian stage is less common than many later Jurassic ammonites, increasing its collector appeal.

Paleoenvironment & Scientific Significance

During the Aalenian stage, the seas over present-day Normandy were rich with life, including marine reptiles, bivalves, belemnites, and diverse ammonites. Cleviceras exaratum was a nektonic carnivore, likely feeding on crustaceans, fish fry, and other small invertebrates. The chambered phragmocone of its shell allowed buoyancy control, enabling it to move vertically in the water column with precision.

The species is an important index fossil for the Aalenian, helping geologists correlate marine strata across Europe. Its clearly defined morphological traits make it valuable for biostratigraphic dating and paleoenvironmental reconstruction. The well-preserved ribbing and keel also offer insight into hydrodynamic adaptations in Jurassic ammonites.

A Distinctive Piece of Jurassic History

This Cleviceras exaratum fossil is both a scientifically significant specimen and a striking natural work of art. Its combination of rarity, provenance, and aesthetic appeal makes it a superb addition to any serious fossil collection or an unforgettable gift for enthusiasts of natural history.

All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. The fossil pictured is the exact specimen you will receive.

(Actual as seen)

Only 1 left in stock

SKU: UF4685 Category:

Description

Rare Aalenian Fossil Ammonite from Calvados, France

This listing features a rare Cleviceras exaratum fossil ammonite from the Aalenian stage of the Middle Jurassic period, discovered in the renowned fossil-rich deposits of Calvados, Normandy, France. This superb specimen was carefully selected for its preservation, distinct morphological detail, and natural beauty. The photographs show the exact fossil you will receive, ensuring complete transparency and confidence in your purchase.

Geological Age & Formation

Cleviceras exaratum lived during the Aalenian stage, approximately 174.1 to 170.3 million years ago. This was a time when much of what is now northern France lay beneath shallow, temperate seas. These marine conditions provided an ideal environment for ammonites to flourish, and the fine-grained sediments that accumulated on the sea floor preserved their shells in remarkable detail. The Calvados region is especially well known for yielding ammonites of outstanding quality and scientific importance, making specimens from this area highly prized among collectors.

Species Identification & Morphology

Cleviceras exaratum belongs to the family Hildoceratidae within the superfamily Hildoceratoidea and order Ammonitida. It is easily recognised by its involute shell with narrow whorls, strong radial ribbing, and distinctive keel running along the venter. The ribs are relatively sharp and well-spaced, adding both structural strength and visual elegance to the shell. This species’ streamlined shape suggests adaptations for active swimming in the open water column, making it an efficient predator of small marine organisms. The suture lines, visible on this specimen, exhibit the complex folded patterns typical of advanced Jurassic ammonites.

Collector Highlights

  • Preservation: Crisp ribbing, well-defined keel, and clear suture patterns.
  • Authenticity: 100% genuine fossil, supplied with a Certificate of Authenticity.
  • Display Quality: Highly aesthetic specimen, perfect for cabinet display, teaching collections, or as a unique decorative piece.
  • Provenance: Sourced from the famous Calvados deposits in Normandy, France.
  • Rarity: Cleviceras exaratum from the Aalenian stage is less common than many later Jurassic ammonites, increasing its collector appeal.

Paleoenvironment & Scientific Significance

During the Aalenian stage, the seas over present-day Normandy were rich with life, including marine reptiles, bivalves, belemnites, and diverse ammonites. Cleviceras exaratum was a nektonic carnivore, likely feeding on crustaceans, fish fry, and other small invertebrates. The chambered phragmocone of its shell allowed buoyancy control, enabling it to move vertically in the water column with precision.

The species is an important index fossil for the Aalenian, helping geologists correlate marine strata across Europe. Its clearly defined morphological traits make it valuable for biostratigraphic dating and paleoenvironmental reconstruction. The well-preserved ribbing and keel also offer insight into hydrodynamic adaptations in Jurassic ammonites.

A Distinctive Piece of Jurassic History

This Cleviceras exaratum fossil is both a scientifically significant specimen and a striking natural work of art. Its combination of rarity, provenance, and aesthetic appeal makes it a superb addition to any serious fossil collection or an unforgettable gift for enthusiasts of natural history.

All of our fossils are 100% genuine specimens and come with a Certificate of Authenticity. The fossil pictured is the exact specimen you will receive.

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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