Ptychophylloceras jeudeni Ammonite Fossil France with COA

Description

Genuine Ptychophylloceras jeudeni Ammonite Fossil

This genuine ammonite fossil is identified as Ptychophylloceras jeudeni and comes from Gap in the Hautes-Alpes region of France. It dates to the Barremian Stage of the Lower Cretaceous and is a carefully chosen European specimen with valuable species, geological age, and locality information. The photographs show the actual fossil offered for sale, so the ammonite pictured is the exact specimen you will receive.

Barremian Lower Cretaceous Age

The Barremian is a stage of the Early Cretaceous Period, spanning approximately 129 to 125 million years ago. During this interval, warm seas covered extensive areas of southern Europe and the Tethyan realm. Marine communities included ammonites, belemnites, bivalves, gastropods, fish, and many other organisms adapted to open-water and sea-floor environments.

After death, an ammonite shell could settle onto the seabed and become buried by fine marine sediment. Compaction, mineral replacement, and later geological uplift preserved the shell or internal mould as a fossil. The documented Barremian age gives this specimen a precise place within the Lower Cretaceous marine succession.

Ptychophylloceras jeudeni

Ptychophylloceras was an extinct marine cephalopod with a coiled shell divided internally into chambers. The living animal occupied the final body chamber, while earlier sealed chambers assisted with buoyancy control. Ammonites were relatives of modern squid, cuttlefish, and nautiluses, although they formed their own diverse and now extinct group.

Ptychophylloceras belongs to the phylloceratid ammonites, a lineage generally recognised for comparatively smooth, involute shells and intricate leaf-like suture patterns. The sutures mark where internal chamber walls met the outer shell, creating complex natural designs that reinforced the chambered structure. Examine the photographs for the whorl shape, narrow umbilical region, growth lines, sutural detail, natural matrix, and preserved surface features visible on this individual Ptychophylloceras jeudeni.

Scientific and Stratigraphic Interest

Ammonites evolved relatively rapidly and were widely distributed through ancient oceans. Their changing shell forms make them valuable index fossils, allowing geologists to compare sedimentary sequences and establish relative ages. Phylloceratids had a long evolutionary history and were important components of Jurassic and Cretaceous marine faunas.

An ammonite shell grew by adding progressively larger chambers around the outer whorl. Differences in whorl proportions, degree of involution, shell compression, ornament, and suture patterns help palaeontologists distinguish species and interpret growth. The elegant form of Ptychophylloceras offers a strong contrast to the heavily ribbed and tuberculate shells of many other Cretaceous ammonites.

Gap and Hautes-Alpes Provenance

Gap lies in the Hautes-Alpes of southeastern France, within a region internationally recognised for extensive Mesozoic marine sedimentary rocks. These strata formed along the ancient margins of the Tethys Ocean and preserve rich ammonite assemblages used for biostratigraphic study. Later Alpine uplift exposed sediments that originally accumulated beneath ancient seas.

A fossil from a named locality such as Gap carries valuable geographical and geological context. It can complement a collection arranged by European country, French department, geological stage, ammonite genus, or ancient marine environment.

Natural Fossil Character

Natural colour, mineral texture, small breaks, areas of wear, and variations in preservation reflect the fossil’s long geological history. These are expected features of an authentic specimen rather than manufacturing defects. Every ammonite preserves a different balance of shell material, mineral replacement, internal mould, and surrounding rock, giving each piece unique character.

The multiple photographs show this exact Ptychophylloceras jeudeni from useful angles. They allow close inspection of its condition, smooth shell form, outline, matrix, proportions, and display qualities. Full sizing is shown in the photographs, which provide the clearest scale information for this individual fossil. The images are not stock photographs and do not represent a similar specimen.

Certificate of Authenticity

This genuine fossil includes a generic Certificate of Authenticity card with a lifetime guarantee. Its Barremian age, Hautes-Alpes provenance, elegant phylloceratid form, and authentic natural preservation make it a distinctive addition to a fossil cabinet, study collection, office display, or educational setting. It is also a thoughtful gift for anyone interested in French fossils, Lower Cretaceous geology, ammonite evolution, palaeontology, or genuine natural history specimens.