Phylloceras Ammonite Fossil New Zealand Aptian Cretaceous with COA

Description

Genuine Phylloceras Ammonite Fossil

This genuine ammonite fossil is identified as Phylloceras species and comes from New Zealand. It dates to the Aptian Stage of the Lower Cretaceous and is a carefully selected Southern Hemisphere specimen with useful genus, geological age, and country information. The photographs show the actual fossil offered for sale, so the ammonite pictured is the exact specimen you will receive.

Phylloceras was an extinct marine cephalopod with a coiled, chambered shell. During growth, the animal added 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 branch.

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 the world. Ammonites shared these waters with bivalves, gastropods, belemnites, fish, marine reptiles, and other organisms. 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 Mesozoic 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.

Phylloceratid Shell Form

Phylloceras belongs to a long-lived group of ammonites known for generally smooth or finely ornamented, involute shells with complex leaf-like suture patterns. The genus name refers to these intricately divided sutures, which resemble foliage where internal chamber walls met the outer shell. Such features helped strengthen the chambered shell while retaining a streamlined overall form.

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

New Zealand Geological Provenance

New Zealand preserves important marine sedimentary rocks from the Cretaceous, recording ancient environments along the margin of the southern Pacific. Fossils from these rocks contribute to understanding marine life in the Southern Hemisphere and provide an interesting geographical contrast with ammonites from Europe, Africa, and North America.

A specimen with documented country provenance carries more collecting and educational context than an entirely unlocalised fossil. Natural colour, mineral texture, small breaks, areas of wear, and differences in surface preservation reflect the specimen’s long geological history. These are authentic characteristics of an ancient fossil rather than signs of modern manufacture.

Every fossil preserves a different balance of shell, mineral replacement, and surrounding rock. The multiple photographs show this exact specimen 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 Phylloceras 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 ammonite form, Aptian age, New Zealand provenance, Southern Hemisphere context, 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, New Zealand palaeontology, or ammonite evolution.