Rare 11" Perisphinctes plicatus Ammonite Fossil Jurassic France Upper Callovian Deux Sevres Large Display Specimen
£ 360.00
Impressive Large Jurassic Ammonite from FranceThis exceptional 11-inch Perisphinctes plicatus ammonite fossil originates from
the Upper Callovian deposits of Deux-Sèvres, France. Representing a classic example of Middle Jurassic marine life, this large and visually striking specimen showcases the beauty and complexity of ammonite evolution during a time when shallow seas covered much of Europe. Its impressive size and strong natural detail make it a standout display piece for collectors and enthusiasts alike.Geological Age and FormationDating to the Upper Callovian stage of the Middle Jurassic period, approximately 163–166 million years ago, this fossil formed within a warm, shallow marine environment. During this time, the region that is now western France was submerged beneath a tropical epicontinental sea, rich in marine biodiversity. Fine carbonate sediments accumulated on the sea floor, allowing for exceptional fossil preservation.The fossil-bearing strata of Deux-Sèvres are well known for yielding high-quality ammonites, often preserved within limestone nodules that protect intricate shell details. These sedimentary conditions enabled delicate structures, such as ribbing and growth lines, to remain clearly visible millions of years later.Species and Taxonomic SignificancePerisphinctes plicatus belongs to the order Ammonitida, within the family Perisphinctidae and superfamily Perisphinctoidea. This group is particularly important in Jurassic stratigraphy due to their rapid evolution and wide distribution, making them valuable index fossils for correlating rock layers across different regions.The genus Perisphinctes is especially recognised for its complex ribbing patterns and evolutionary diversity. The species plicatus is known for its well-developed ornamentation and large shell size, reflecting a highly successful lineage of marine cephalopods.Morphology and Distinctive FeaturesThis specimen exhibits the classic evolute coiling characteristic of Perisphinctes, where the whorls are only partially overlapping, leaving earlier coils visible. The shell displays strong, bifurcating ribs that branch as they extend across the flanks, a defining feature of the species. These ribs often sweep gently forward, adding to the dynamic appearance of the fossil.The venter is rounded, lacking a pronounced keel, which distinguishes it from many earlier Jurassic ammonites. The robust ribbing not only adds aesthetic appeal but also reflects structural adaptations that may have helped strengthen the shell against predation and environmental pressures.At approximately 11 inches across, this is a substantial specimen, offering excellent visual impact. Its size and clarity of detail make it highly desirable for both display and study purposes.Authenticity and ProvenanceThis fossil is a genuine specimen, carefully selected for quality and presentation. The photograph provided shows the exact ammonite you will receive, ensuring full confidence in your purchase. Each detail visible reflects millions of years of natural preservation, making this a truly unique piece.Included with the fossil is a fully hand-signed Premium Certificate of Authenticity, verifying its identification, geological origin, and authenticity. This adds significant value, particularly for collectors seeking documented and reliable specimens.A Classic Collector’s FossilAmmonites such as Perisphinctes plicatus are among the most recognisable and sought-after fossils in the world. Their intricate forms and historical significance have fascinated collectors for centuries. Specimens from the French Jurassic, particularly from Deux-Sèvres, are prized for their size, preservation, and scientific importance.This large ammonite represents a remarkable window into the ancient oceans of the Jurassic, capturing both the beauty of natural design and the depth of geological time.
the Upper Callovian deposits of Deux-Sèvres, France. Representing a classic example of Middle Jurassic marine life, this large and visually striking specimen showcases the beauty and complexity of ammonite evolution during a time when shallow seas covered much of Europe. Its impressive size and strong natural detail make it a standout display piece for collectors and enthusiasts alike.Geological Age and FormationDating to the Upper Callovian stage of the Middle Jurassic period, approximately 163–166 million years ago, this fossil formed within a warm, shallow marine environment. During this time, the region that is now western France was submerged beneath a tropical epicontinental sea, rich in marine biodiversity. Fine carbonate sediments accumulated on the sea floor, allowing for exceptional fossil preservation.The fossil-bearing strata of Deux-Sèvres are well known for yielding high-quality ammonites, often preserved within limestone nodules that protect intricate shell details. These sedimentary conditions enabled delicate structures, such as ribbing and growth lines, to remain clearly visible millions of years later.Species and Taxonomic SignificancePerisphinctes plicatus belongs to the order Ammonitida, within the family Perisphinctidae and superfamily Perisphinctoidea. This group is particularly important in Jurassic stratigraphy due to their rapid evolution and wide distribution, making them valuable index fossils for correlating rock layers across different regions.The genus Perisphinctes is especially recognised for its complex ribbing patterns and evolutionary diversity. The species plicatus is known for its well-developed ornamentation and large shell size, reflecting a highly successful lineage of marine cephalopods.Morphology and Distinctive FeaturesThis specimen exhibits the classic evolute coiling characteristic of Perisphinctes, where the whorls are only partially overlapping, leaving earlier coils visible. The shell displays strong, bifurcating ribs that branch as they extend across the flanks, a defining feature of the species. These ribs often sweep gently forward, adding to the dynamic appearance of the fossil.The venter is rounded, lacking a pronounced keel, which distinguishes it from many earlier Jurassic ammonites. The robust ribbing not only adds aesthetic appeal but also reflects structural adaptations that may have helped strengthen the shell against predation and environmental pressures.At approximately 11 inches across, this is a substantial specimen, offering excellent visual impact. Its size and clarity of detail make it highly desirable for both display and study purposes.Authenticity and ProvenanceThis fossil is a genuine specimen, carefully selected for quality and presentation. The photograph provided shows the exact ammonite you will receive, ensuring full confidence in your purchase. Each detail visible reflects millions of years of natural preservation, making this a truly unique piece.Included with the fossil is a fully hand-signed Premium Certificate of Authenticity, verifying its identification, geological origin, and authenticity. This adds significant value, particularly for collectors seeking documented and reliable specimens.A Classic Collector’s FossilAmmonites such as Perisphinctes plicatus are among the most recognisable and sought-after fossils in the world. Their intricate forms and historical significance have fascinated collectors for centuries. Specimens from the French Jurassic, particularly from Deux-Sèvres, are prized for their size, preservation, and scientific importance.This large ammonite represents a remarkable window into the ancient oceans of the Jurassic, capturing both the beauty of natural design and the depth of geological time.
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