Holcophylloceras mediterraneum Ammonite Fossil Switzerland with COA

Description

Genuine Holcophylloceras Ammonite Fossil

This genuine ammonite fossil is identified as Holcophylloceras mediterraneum and comes from Switzerland. It dates to the Aptian Stage of the Lower Cretaceous and is a carefully selected European specimen with valuable species, geological age, and country provenance. The photographs show the actual fossil offered for sale, so the ammonite pictured is the exact specimen you will receive.

Holcophylloceras was an extinct marine cephalopod with a coiled, chambered shell. During growth, the animal formed progressively larger chambers around the outer whorl. The living ammonite occupied the final body chamber, while older sealed chambers contributed to buoyancy control. Ammonites were relatives of living squid, cuttlefish, and nautiluses, although they belonged to their own extinct and highly diverse group.

Aptian Lower Cretaceous Age

The Aptian is a stage within the Early Cretaceous Period, approximately 125 to 113 million years ago. During this interval, changing seas and climates supported varied marine ecosystems across Europe and the wider world. Ammonites shared these waters with bivalves, gastropods, belemnites, fish, and marine reptiles. After death, a shell could settle on the sea floor and become buried within sediment. Compaction, mineral replacement, and geological change then preserved portions of the shell as a fossil.

Ammonites evolved rapidly and were widely distributed through Cretaceous oceans. Their changing shell forms make them valuable index fossils, helping geologists compare sedimentary sequences and establish relative ages. The documented Aptian age gives this specimen a clear position within the Lower Cretaceous succession.

Swiss Geological Provenance

Switzerland preserves marine sedimentary rocks associated with the ancient Tethys Ocean and its margins. These rocks record times when marine environments covered areas now uplifted within and around the Alps. Fossils from Swiss Cretaceous deposits provide evidence of ancient sea life and illustrate the major geological changes that later formed the modern landscape.

A specimen with documented country provenance carries more collecting and educational context than an entirely unlocalised fossil. It can complement a collection arranged by European country, Cretaceous stage, ammonite genus, or ancient marine environment.

Phylloceratid Shell Form

Holcophylloceras belongs to the phylloceratid ammonites, a group generally recognised for smooth or finely ornamented, involute shells and complex leaf-like suture patterns. The sutures mark where internal chamber walls joined the outer shell, creating intricate natural designs that helped strengthen the chambered structure.

Examine the photographs for visible whorls, shell outline, umbilical region, surface texture, matrix, and preserved details on this individual example. Whorl proportions, degree of involution, ornament, constrictions, and sutural features are among the characteristics used when comparing phylloceratid ammonites and interpreting growth.

Natural colour, mineral texture, small breaks, areas of wear, and differences in surface preservation reflect the fossil’s long geological history. Every specimen preserves a different balance of original shell, mineral replacement, and surrounding rock. The multiple photographs show this exact fossil from useful angles and present its condition, proportions, texture, and natural display character more accurately than a generic image could.

Exact Specimen and Full Sizing

Full sizing is shown in the photographs, which provide the best scale information for this individual fossil. The images are not stock photographs and do not represent a similar piece. They show the exact Holcophylloceras mediterraneum ammonite fossil that will be supplied.

Authenticity and Presentation

This is a genuine fossil specimen and includes a generic Certificate of Authenticity card with a lifetime guarantee. It has been carefully chosen for its characteristic phylloceratid form, Aptian age, Swiss provenance, and natural geological character. It makes a distinctive addition to a cabinet collection, educational display, office, study, or gift for anyone interested in authentic Lower Cretaceous fossils, Swiss palaeontology, or ammonite evolution.