Hildoceras angustiphonatum Ammonite Fossil Middle Toarcian Jurassic Aveyron France Genuine Specimen

Description

Authentic Hildoceras angustiphonatum Ammonite Fossil from Aveyron, France

This genuine Hildoceras angustiphonatum ammonite fossil comes from the Middle Toarcian stage of the Jurassic Period, dating to around 181–174 million years ago, and was discovered in the renowned fossil-bearing deposits of Aveyron, France. Known for its scientific significance and distinctively ribbed shell, this ammonite represents both a valuable collector’s item and a striking natural display piece. Every specimen is carefully selected for quality, and the fossil you see in the photographs is the exact one you will receive, accompanied by a Certificate of Authenticity.

Geological Background

The Toarcian stage of the Jurassic Period was a time of significant environmental change, including widespread marine transgressions and the famous Toarcian Oceanic Anoxic Event, which reshaped global ecosystems. Fossils from this period provide essential evidence of how marine life adapted to these shifts.

The ammonite was preserved within sedimentary layers deposited in the shallow seas of what is today southern France. These rocks, composed of marls and limestones, were part of the margins of the ancient Tethys Ocean. The excellent preservation conditions of the Aveyron region have made it one of the classic localities for Jurassic ammonites, allowing collectors and researchers alike to study specimens with fine morphological detail.

Scientific Classification

• Class: Cephalopoda
• Subclass: Ammonoidea
• Order: Ammonitida
• Superfamily: Hildoceratoidea
• Family: Hildoceratidae
• Genus: Hildoceras
• Species: Hildoceras angustiphonatum

This species of Hildoceras serves as an important index fossil for the Middle Toarcian, helping geologists to correlate strata across Europe. Its restricted stratigraphic range makes it especially valuable for biozonation and dating of Jurassic deposits.

Morphological Features

The Hildoceras angustiphonatum ammonite is distinguished by its slender, finely ribbed shell compared to other robust members of the genus. The whorls are moderately involute, with narrow ribs that extend across the flanks and cross the venter in a consistent pattern. This delicate ornamentation reflects both hydrodynamic adaptations for swimming in open waters and evolutionary differentiation within the family Hildoceratidae.

The compressed form and closely spaced ribbing of this species provide a refined aesthetic that makes it particularly desirable for collectors. Its morphology also demonstrates the diversity of ammonite shell structures during the Toarcian stage, offering insight into evolutionary experimentation and adaptation.

Paleoecological Importance

As a free-swimming cephalopod, Hildoceras angustiphonatum thrived in the open marine environment, likely preying upon smaller marine animals such as crustaceans and juvenile fish. The presence of this ammonite in Aveyron highlights the richness of marine life in the Jurassic seas of Europe and contributes to our understanding of marine ecosystems during a time of dynamic environmental change.

The fossil record of Hildoceras angustiphonatum provides critical data for reconstructing the Middle Toarcian marine environment, especially in the context of the climatic and ecological aftermath of the Toarcian Oceanic Anoxic Event. Its evolutionary role and distribution across European basins make it a cornerstone species for Jurassic biostratigraphy.

A Rare and Certified Collector’s Specimen

This Hildoceras angustiphonatum ammonite fossil from Aveyron, France, is a rare and scientifically significant specimen, perfect for both serious collectors and enthusiasts of natural history. Its aesthetic shell structure, combined with its role as an index fossil, ensures it holds both academic and display value.

Supplied with a Certificate of Authenticity and photographed to show the exact specimen you will receive, this ammonite fossil represents a tangible piece of Earth’s ancient marine heritage, preserved for over 180 million years and ready to be appreciated in your collection.