Leptosphinctes Ammonite Fossil Bajocian Jurassic France Authentic Specimen COA
£ 14.40
LEPTOSPHINCTES AMMONITE FOSSILThis listing features a Leptosphinctes Ammonite Fossil from the Bajocian stage
of the Middle Jurassic, collected at Evrecy, Calvados, France. Dating back around 170 million years, this ammonite is an excellent example of a classic Jurassic species from the renowned deposits of northern France. The exact specimen shown in the photographs is the one you will receive, with a 1 cm scale cube included for precise measurement reference. All of our fossils are 100% genuine and come with a Certificate of Authenticity. GEOLOGICAL CONTEXT – EVRECY, CALVADOS, FRANCEThe fossil originates from the Bajocian deposits of Calvados, a region well-known for its rich Middle Jurassic fossil record. During the Bajocian stage, much of northern France was covered by shallow seas connected to the Tethys Ocean, creating warm marine environments ideal for ammonite diversification. Sediments of limestone and marl accumulated in these basins, preserving ammonites and other invertebrates in remarkable detail.The Bajocian is an especially significant interval in Jurassic paleontology, as it represents a period of evolutionary radiation among ammonites. Fossil-rich regions such as Evrecy provide material that is critical for biostratigraphy, enabling paleontologists to subdivide the Bajocian into precise ammonite zones used for global correlation. SPECIES OVERVIEW – LEPTOSPHINCTESThis specimen belongs to the genus Leptosphinctes, part of the order Ammonitida, superfamily Perisphinctoidea, and family Perisphinctidae. Ammonites of this genus are characterised by their relatively compressed, evolute shells with regularly spaced ribs that radiate cleanly across the flanks. These ribs may be simple or occasionally bifurcate, producing a delicate and elegant pattern.The morphology of Leptosphinctes reveals adaptations suited for an active, nektonic lifestyle. Its compressed shell with fine ribbing suggests streamlined movement in open marine waters, where it likely preyed on smaller invertebrates. Its diagnostic features make it an important genus for Jurassic taxonomy and stratigraphy. PALEONTOLOGICAL IMPORTANCELeptosphinctes ammonites are crucial index fossils for the Bajocian stage. Their clearly defined stratigraphic ranges and distinctive features allow paleontologists to establish and refine ammonite biozones, which are essential for dating Jurassic marine deposits. The occurrence of Leptosphinctes in Calvados deposits provides a key reference point within the broader Jurassic sequence of Europe.From an evolutionary perspective, Leptosphinctes highlights the diversification of perisphinctid ammonites during the Middle Jurassic. Its streamlined shell and fine ornamentation demonstrate evolutionary experiments in shell morphology that characterised ammonites throughout their long history. COLLECTOR’S AND EDUCATIONAL VALUEThis Leptosphinctes ammonite fossil is a desirable specimen for collectors of French Jurassic material. Its provenance from Evrecy, Calvados adds scientific and historical value, as fossils from this locality have contributed significantly to the understanding of Jurassic stratigraphy. The fossil’s elegant ribbing and classic ammonite form make it equally suited for display or for educational use in teaching geology and paleontology. GUARANTEE OF AUTHENTICITY
• 100% genuine Leptosphinctes ammonite fossil
• Supplied with a Certificate of Authenticity
• The exact specimen shown in the photographs will be sentThis is a rare opportunity to acquire a scientifically significant and beautifully preserved Leptosphinctes Ammonite Fossil from the Bajocian of Evrecy, Calvados, France, an outstanding example of Jurassic marine life.
of the Middle Jurassic, collected at Evrecy, Calvados, France. Dating back around 170 million years, this ammonite is an excellent example of a classic Jurassic species from the renowned deposits of northern France. The exact specimen shown in the photographs is the one you will receive, with a 1 cm scale cube included for precise measurement reference. All of our fossils are 100% genuine and come with a Certificate of Authenticity. GEOLOGICAL CONTEXT – EVRECY, CALVADOS, FRANCEThe fossil originates from the Bajocian deposits of Calvados, a region well-known for its rich Middle Jurassic fossil record. During the Bajocian stage, much of northern France was covered by shallow seas connected to the Tethys Ocean, creating warm marine environments ideal for ammonite diversification. Sediments of limestone and marl accumulated in these basins, preserving ammonites and other invertebrates in remarkable detail.The Bajocian is an especially significant interval in Jurassic paleontology, as it represents a period of evolutionary radiation among ammonites. Fossil-rich regions such as Evrecy provide material that is critical for biostratigraphy, enabling paleontologists to subdivide the Bajocian into precise ammonite zones used for global correlation. SPECIES OVERVIEW – LEPTOSPHINCTESThis specimen belongs to the genus Leptosphinctes, part of the order Ammonitida, superfamily Perisphinctoidea, and family Perisphinctidae. Ammonites of this genus are characterised by their relatively compressed, evolute shells with regularly spaced ribs that radiate cleanly across the flanks. These ribs may be simple or occasionally bifurcate, producing a delicate and elegant pattern.The morphology of Leptosphinctes reveals adaptations suited for an active, nektonic lifestyle. Its compressed shell with fine ribbing suggests streamlined movement in open marine waters, where it likely preyed on smaller invertebrates. Its diagnostic features make it an important genus for Jurassic taxonomy and stratigraphy. PALEONTOLOGICAL IMPORTANCELeptosphinctes ammonites are crucial index fossils for the Bajocian stage. Their clearly defined stratigraphic ranges and distinctive features allow paleontologists to establish and refine ammonite biozones, which are essential for dating Jurassic marine deposits. The occurrence of Leptosphinctes in Calvados deposits provides a key reference point within the broader Jurassic sequence of Europe.From an evolutionary perspective, Leptosphinctes highlights the diversification of perisphinctid ammonites during the Middle Jurassic. Its streamlined shell and fine ornamentation demonstrate evolutionary experiments in shell morphology that characterised ammonites throughout their long history. COLLECTOR’S AND EDUCATIONAL VALUEThis Leptosphinctes ammonite fossil is a desirable specimen for collectors of French Jurassic material. Its provenance from Evrecy, Calvados adds scientific and historical value, as fossils from this locality have contributed significantly to the understanding of Jurassic stratigraphy. The fossil’s elegant ribbing and classic ammonite form make it equally suited for display or for educational use in teaching geology and paleontology. GUARANTEE OF AUTHENTICITY
• 100% genuine Leptosphinctes ammonite fossil
• Supplied with a Certificate of Authenticity
• The exact specimen shown in the photographs will be sentThis is a rare opportunity to acquire a scientifically significant and beautifully preserved Leptosphinctes Ammonite Fossil from the Bajocian of Evrecy, Calvados, France, an outstanding example of Jurassic marine life.
