Perisphinctes cf polysphinctus Ammonite Fossil Normandy with COA

Description

Perisphinctes cf. polysphinctus Ammonite Fossil

A Genuine Middle Jurassic Fossil from Normandy

This authentic ammonite fossil is identified as Perisphinctes cf. polysphinctus and comes from Ranville in Normandy, France. It dates to the Lower Bathonian interval of the Middle Jurassic, placing it within a marine ecosystem around 168 million years old. The listing photographs show the exact specimen offered for sale, allowing its natural coiling, ribbing, matrix and individual preservation to be examined before purchase. Full dimensions are provided in the dedicated sizing photograph.

Lower Bathonian Geology

The Bathonian was a stage of the Middle Jurassic lasting from approximately 168.2 to 165.3 million years ago. During the Lower Bathonian, much of northwestern Europe was influenced by warm shallow seas. Limestone, marl and other marine sediments accumulated across shelves and basins, preserving the remains of ammonites, bivalves, brachiopods, echinoids and other organisms. These rocks now provide a record of changing Jurassic environments and biological communities.

Ammonite fossils are particularly important in marine stratigraphy because many lineages evolved rapidly and spread over broad geographical areas. Their changing species and shell forms help palaeontologists compare sedimentary layers and refine geological ages. A specimen with recorded locality and stage information therefore retains meaningful scientific context beyond its visual appeal.

Ranville and Normandy Provenance

Ranville lies in the Calvados department of Normandy, a region well known for Jurassic sedimentary rocks and fossil localities. Marine deposits exposed around Normandy document environments that existed long before the modern English Channel and coastal landscape developed. Retaining the Ranville provenance with this fossil preserves an important part of its geological history and distinguishes it from ammonites whose locality has been lost.

About Perisphinctes cf. polysphinctus

Perisphinctes is a familiar Jurassic ammonite genus associated with strongly ribbed, evolute shells in which much of the earlier whorls remains visible. Rib patterns may divide or change across the shell as the animal grew. These features make perisphinctid ammonites attractive to collectors and informative for palaeontologists studying shell development, variation and Jurassic biostratigraphy.

The abbreviation cf. means that the specimen compares closely with Perisphinctes polysphinctus while preserving appropriate caution in the species-level identification. This is a standard palaeontological convention and retains the supplied taxonomic information without overstating certainty. Visible whorl shape, coiling and ribbing all contribute to its classification and collecting interest.

Life of the Ammonite

Ammonites were extinct marine cephalopods related to modern squid, cuttlefish and nautiluses. The living animal occupied the outer body chamber, while the older portion of the shell was divided by septa into a series of sealed chambers. These chambers assisted with buoyancy control. The intricate lines where septa met the outer shell, called sutures, are important features used in ammonite identification.

As this ammonite grew, it added new shell material at the aperture, expanding the spiral while leaving older chambered portions behind. The fossilised shell records aspects of that growth and provides a direct link to the animal that moved through the Jurassic sea.

Natural Preservation

This genuine fossil has passed through burial, mineralisation, compaction, erosion, exposure and discovery. Natural matrix, mineral colour, weathering, fine cracks, minor losses or uneven surfaces may be present. These characteristics belong to the specimen’s geological history and are not modern manufacturing defects. Please inspect every image carefully because the photographs provide the clearest guide to this individual fossil’s condition. The ammonite pictured is the exact specimen you will receive, and no substitute will be supplied.

Collecting and Authenticity

This Normandy ammonite is suitable for a Jurassic fossil collection, geology cabinet, natural-history display or educational study set. Its Lower Bathonian age, Ranville locality and carefully qualified identification make it relevant to collectors of European ammonites, French fossils and marine cephalopods. It includes a generic Certificate of Authenticity card carrying a lifetime guarantee of authenticity. The documented provenance is Lower Bathonian, Middle Jurassic, Ranville, Normandy, France. The sizing photograph provides the measurements needed for secure storage or display planning.