RARE Alocolytoceras angustum Fossil Ammonite Jurassic Upper Toarcian France Authentic

Description

Rare Alocolytoceras angustum Fossil Ammonite from France

This listing presents a rare and genuine Alocolytoceras angustum Fossil Ammonite, originating from the Upper Toarcian stage of the Jurassic period, discovered in the fossil-rich deposits of T de Balduce, France. A remarkable specimen of a sought-after genus, this ammonite highlights the elegance and scientific importance of Jurassic cephalopods. With its distinctive coiling and finely preserved details, it is both a collectible fossil and an important piece of Earth’s natural history.

Every specimen we offer is carefully chosen, and the photographs show the exact fossil you will receive. A 1 cm scale cube is included for accurate sizing. All of our fossils are 100% genuine and come with a Certificate of Authenticity, making this ammonite a secure and valuable acquisition.

Geological Age and Provenance

This ammonite dates to the Upper Toarcian stage of the Lower Jurassic, approximately 178 – 175 million years ago. The Toarcian was a pivotal time in marine history, marked by significant evolutionary developments and diversification of ammonite species.

The deposits of T de Balduce in France are celebrated for their beautifully preserved ammonite faunas. These marine sediments were formed in shallow epicontinental seas, where fine silt and mud accumulated, preserving marine organisms with exceptional clarity. Ammonites such as Alocolytoceras angustum are important markers within these strata, offering insights into the evolution and distribution of cephalopods during the Jurassic.

Scientific Classification and Identification

This specimen has been identified as Alocolytoceras angustum, a member of the family Lytoceratidae, within the order Ammonitida and superfamily Lytoceratoidea. The Lytoceratidae are among the most distinctive ammonites, recognised for their evolute shell forms and highly intricate suture patterns.

Alocolytoceras angustum is notable for its elongated whorl structure and striking morphology, which distinguish it from other lytoceratid genera. Its identification within Upper Toarcian deposits makes it an important reference species in Jurassic ammonite biostratigraphy.

Morphology and Distinctive Features

The morphology of Alocolytoceras angustum is defined by its evolute coiling, with visible whorls arranged in a graceful spiral. The shell often shows slender proportions, giving it an elegant appearance compared to broader ammonite forms. The suture lines are highly elaborate, consisting of deep lobes and sharply indented saddles, characteristic of the Lytoceratidae family.

These features are not simply ornamental. The complexity of the shell design reflects adaptations for buoyancy control and swimming efficiency. As active predators or opportunistic feeders, ammonites like Alocolytoceras angustum played a vital role in Jurassic marine ecosystems.

Depositional Environment

The Toarcian seas of southern France were warm, shallow marine environments that supported thriving ecosystems of ammonites, belemnites, bivalves, and marine reptiles. Low-oxygen conditions in parts of these seas often allowed for the exceptional preservation of delicate shell structures. As a result, fossils from T de Balduce retain intricate details of their morphology, making them prized by collectors and researchers alike.

Collectible and Scientific Importance

Specimens of Alocolytoceras angustum are relatively rare, particularly from classic French localities. Their scarcity, combined with their diagnostic features, makes them highly sought after by both professional paleontologists and private collectors. This specimen represents not only an extraordinary natural artifact but also a scientifically important fossil that contributes to our understanding of Jurassic cephalopods.

Key Features of This Fossil

• Rare Alocolytoceras angustum ammonite from T de Balduce, France
• Jurassic (Upper Toarcian stage), approx. 178 – 175 million years old
• Member of the Lytoceratidae family, with intricate suture patterns
• Slender, evolute shell morphology with visible whorls
• Supplied with a Certificate of Authenticity
• The exact specimen pictured is the one you will receive

This Alocolytoceras angustum Fossil Ammonite is a striking specimen that captures the elegance and rarity of Jurassic ammonites. Its provenance, preservation, and scientific value make it a truly exceptional addition to any fossil collection.