Leptosphinctes cleistus Ammonite Fossil Bajocian Jurassic France Authentic Specimen COA
£ 14.40
LEPTOSPHINCTES CLEISTUS AMMONITE FOSSILThis listing features a fine Leptosphinctes cleistus Ammonite Fossil from the
Bajocian stage of the Middle Jurassic, collected in Evrecy, Calvados, France. At approximately 170 million years old, this specimen represents a scientifically valuable ammonite from one of northern France’s most important Jurassic fossil localities. The ammonite shown in the photographs is the exact specimen you will receive, with a 1 cm scale cube for reference. Every piece is 100% genuine and comes with a Certificate of Authenticity. GEOLOGICAL CONTEXT – BAJOCIAN OF EVRECY, FRANCEThe fossil originates from the Jurassic deposits of Evrecy in Calvados, an area celebrated for its rich ammonite faunas. During the Bajocian stage, this region was submerged beneath shallow epicontinental seas connected to the Tethys Ocean. In these marine basins, limestones and marls accumulated, providing ideal conditions for fossil preservation. The Bajocian is one of the most important stages of the Middle Jurassic, noted for an abundance of ammonites that enable detailed biostratigraphic zonation and correlation across Europe.Fossil-bearing horizons in Calvados provide particularly fine specimens, used as reference material in paleontological research. The ammonites from Evrecy are of global importance, as they contribute to defining key ammonite biozones within the Bajocian stage. SPECIES OVERVIEW – LEPTOSPHINCTES CLEISTUSThe specimen belongs to Leptosphinctes cleistus, an extinct species within the order Ammonitida, superfamily Perisphinctoidea, and family Perisphinctidae. Ammonites of this genus are distinguished by their moderately evolute shells with compressed whorls and fine, evenly spaced ribbing.Leptosphinctes cleistus is noted for its elegant rib patterns that run consistently across the flanks, sometimes bifurcating as they approach the venter. These morphological traits give the shell both scientific significance and aesthetic appeal. The streamlined shape and ribbing pattern suggest that it was a nektonic predator, swimming actively in the Jurassic seas, feeding on smaller invertebrates. PALEONTOLOGICAL IMPORTANCELeptosphinctes cleistus is an important index fossil for the Bajocian. Its distinct morphology and defined stratigraphic range make it an excellent tool for establishing ammonite biozones, which allow geologists to correlate marine deposits across wide geographic areas. Such fossils are invaluable in refining the Jurassic timescale and understanding evolutionary trends in ammonite development.The genus Leptosphinctes is particularly significant within the Perisphinctidae, as it represents part of the evolutionary radiation that occurred in the Middle Jurassic. The morphology of L. cleistus reflects an adaptation toward hydrodynamic efficiency, highlighting the ecological roles played by ammonites in Jurassic marine ecosystems. COLLECTOR’S AND EDUCATIONAL VALUEThis Leptosphinctes cleistus ammonite fossil is a valuable addition to any collection of Jurassic fossils. Its provenance from Evrecy in Calvados, France, enhances its desirability, as this locality is internationally renowned for producing well-preserved ammonites of great scientific importance. Collectors will value its elegant ribbing and strong stratigraphic significance, while educators and students can use it as an excellent teaching example of ammonite morphology, paleoecology, and stratigraphy. GUARANTEE OF AUTHENTICITY
• 100% genuine Leptosphinctes cleistus ammonite fossil
• Supplied with a Certificate of Authenticity
• The exact specimen shown in the photographs is the one you will receiveThis is a rare opportunity to own a scientifically important and beautifully preserved Leptosphinctes cleistus Ammonite Fossil from the Bajocian of Evrecy, Calvados, France, an exceptional piece of Jurassic natural history.
Bajocian stage of the Middle Jurassic, collected in Evrecy, Calvados, France. At approximately 170 million years old, this specimen represents a scientifically valuable ammonite from one of northern France’s most important Jurassic fossil localities. The ammonite shown in the photographs is the exact specimen you will receive, with a 1 cm scale cube for reference. Every piece is 100% genuine and comes with a Certificate of Authenticity. GEOLOGICAL CONTEXT – BAJOCIAN OF EVRECY, FRANCEThe fossil originates from the Jurassic deposits of Evrecy in Calvados, an area celebrated for its rich ammonite faunas. During the Bajocian stage, this region was submerged beneath shallow epicontinental seas connected to the Tethys Ocean. In these marine basins, limestones and marls accumulated, providing ideal conditions for fossil preservation. The Bajocian is one of the most important stages of the Middle Jurassic, noted for an abundance of ammonites that enable detailed biostratigraphic zonation and correlation across Europe.Fossil-bearing horizons in Calvados provide particularly fine specimens, used as reference material in paleontological research. The ammonites from Evrecy are of global importance, as they contribute to defining key ammonite biozones within the Bajocian stage. SPECIES OVERVIEW – LEPTOSPHINCTES CLEISTUSThe specimen belongs to Leptosphinctes cleistus, an extinct species within the order Ammonitida, superfamily Perisphinctoidea, and family Perisphinctidae. Ammonites of this genus are distinguished by their moderately evolute shells with compressed whorls and fine, evenly spaced ribbing.Leptosphinctes cleistus is noted for its elegant rib patterns that run consistently across the flanks, sometimes bifurcating as they approach the venter. These morphological traits give the shell both scientific significance and aesthetic appeal. The streamlined shape and ribbing pattern suggest that it was a nektonic predator, swimming actively in the Jurassic seas, feeding on smaller invertebrates. PALEONTOLOGICAL IMPORTANCELeptosphinctes cleistus is an important index fossil for the Bajocian. Its distinct morphology and defined stratigraphic range make it an excellent tool for establishing ammonite biozones, which allow geologists to correlate marine deposits across wide geographic areas. Such fossils are invaluable in refining the Jurassic timescale and understanding evolutionary trends in ammonite development.The genus Leptosphinctes is particularly significant within the Perisphinctidae, as it represents part of the evolutionary radiation that occurred in the Middle Jurassic. The morphology of L. cleistus reflects an adaptation toward hydrodynamic efficiency, highlighting the ecological roles played by ammonites in Jurassic marine ecosystems. COLLECTOR’S AND EDUCATIONAL VALUEThis Leptosphinctes cleistus ammonite fossil is a valuable addition to any collection of Jurassic fossils. Its provenance from Evrecy in Calvados, France, enhances its desirability, as this locality is internationally renowned for producing well-preserved ammonites of great scientific importance. Collectors will value its elegant ribbing and strong stratigraphic significance, while educators and students can use it as an excellent teaching example of ammonite morphology, paleoecology, and stratigraphy. GUARANTEE OF AUTHENTICITY
• 100% genuine Leptosphinctes cleistus ammonite fossil
• Supplied with a Certificate of Authenticity
• The exact specimen shown in the photographs is the one you will receiveThis is a rare opportunity to own a scientifically important and beautifully preserved Leptosphinctes cleistus Ammonite Fossil from the Bajocian of Evrecy, Calvados, France, an exceptional piece of Jurassic natural history.
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