Rare Deshayesites multicostatus Fossil Ammonite Lower Aptian Cretaceous Troyes France

Description

Rare Deshayesites multicostatus Fossil Ammonite

Offered here is a rare Deshayesites multicostatus fossil ammonite, collected from the Lower Aptian stage of the Cretaceous Period, found near Troyes, France. This is an exceptional collector’s specimen, displaying the diagnostic ribbing and elegant coiling that characterises the genus Deshayesites. Ammonites from this stage are highly significant for biostratigraphy, and this fossil represents an important piece of Early Cretaceous natural history. The photographs show the exact ammonite you will receive, with a 1 cm scale cube for accurate measurement. Supplied with a Certificate of Authenticity, it is guaranteed to be 100% genuine.

Geological Context – Lower Aptian, Cretaceous

The Aptian stage (approx. 125–113 million years ago) was part of the Early Cretaceous, a time of considerable marine transgressions and evolutionary diversification among ammonites. Sediments around Troyes in northern France preserve marine fossils in remarkable detail, providing insight into the palaeoenvironment of the shallow Cretaceous seas that covered the region.

The Lower Aptian is especially significant because it contains a diverse assemblage of ammonites, with Deshayesites being among the most important genera for establishing biostratigraphic zones. These ammonites serve as index fossils, allowing precise dating and correlation of rock strata across Europe and beyond.

Fossil Details – Deshayesites multicostatus

This specimen belongs to the Order Ammonitida, Superfamily Deshayesitoidea, and Family Deshayesitidae. The species Deshayesites multicostatus is known for its distinctive ribbing and strong ornamentation. Key features include:

• Regularly spaced ribs that extend across the whorls, often bifurcating as they cross the flanks.
• Planispiral coiling, producing a classic ammonite form with tightly wound whorls.
• Sutures finely preserved, showing the complexity typical of Cretaceous ammonites.
• A compressed shell shape, giving the fossil a refined and detailed appearance.

These features make Deshayesites multicostatus both an easily recognisable and scientifically valuable ammonite, often used in detailed zonal studies of the Lower Aptian.

Scientific and Collector Significance

The genus Deshayesites was first described in the 19th century and has since become one of the most important ammonite groups for Early Cretaceous studies. Their rapid evolutionary changes and widespread distribution make them crucial for correlating marine strata. Fossils of Deshayesites multicostatus are particularly valued by collectors due to their rarity, defined ribbing, and their role in defining the Deshayesites multicostatus biozone within the Aptian.

Ammonites from the Troyes region are not as widely available as those from Folkestone or other Gault Clay sites, making this specimen a desirable addition to any collection. Its sharp detail and well-preserved morphology ensure it is both a display-quality fossil and a scientifically meaningful specimen.

Provenance and Classification

• Species: Deshayesites multicostatus
• Age: Lower Aptian, Early Cretaceous (~125 million years ago)
• Formation: Marine clays and limestones near Troyes
• Locality: Troyes, France
• Order: Ammonitida
• Superfamily: Deshayesitoidea
• Family: Deshayesitidae

A Genuine Collector’s Fossil

This rare Deshayesites multicostatus ammonite is an outstanding fossil from the Lower Aptian of France, combining scientific importance with aesthetic appeal. Its ribbed shell and beautiful form make it a display-worthy piece, while its stratigraphic significance ensures its value to researchers and collectors alike.

Every fossil we sell is a carefully chosen, authentic specimen. Supplied with a Certificate of Authenticity, this ammonite offers you the chance to own a genuine relic of the Cretaceous seas, preserved for over 120 million years and ready to be part of your collection today.