Cardioceras Fossil Ammonite Oxfordian Jurassic Poland Genuine Specimen with Certificate

Description

Authentic Cardioceras Fossil Ammonite from Poland

Presented here is a genuine Cardioceras fossil ammonite from the Oxfordian Stage of the Jurassic Period, discovered in Poland. This remarkable specimen dates back to approximately 163–157 million years ago, a time when much of Europe was submerged beneath warm, shallow seas that teemed with marine life. Ammonites such as Cardioceras are some of the most distinctive and scientifically significant fossils from this period. This carefully chosen specimen is supplied with a Certificate of Authenticity, guaranteeing that it is 100% genuine. The fossil pictured is the exact piece you will receive.

Geological Background

The Oxfordian Stage forms part of the Upper Jurassic and represents an interval of geological time when extensive shallow seas spread across Europe. The region that is now Poland was located in a subtropical marine setting, forming part of the vast Tethys Ocean margins. These warm waters provided an ideal environment for ammonites, belemnites, bivalves, and marine reptiles to flourish. Fine-grained sediments accumulated in these basins, eventually preserving a wealth of marine fossils that today provide exceptional insights into Jurassic ecosystems.

Ammonites from Poland are highly prized by collectors and researchers alike, as they often display superb preservation with distinctive ribbing and detailed shell morphology. Cardioceras, in particular, has long been used by geologists as an important guide fossil, helping to date and correlate Jurassic rocks across Europe.

Scientific Classification

• Genus: Cardioceras
• Family: Cardioceratidae
• Superfamily: Stephanoceratoidea
• Order: Ammonitida
• Class: Cephalopoda
• Age: Oxfordian, Upper Jurassic (~163–157 million years ago)
• Locality: Poland

Morphological Features

The genus Cardioceras is characterised by its distinctively ribbed and often strongly ornamented shells. Ribs typically extend radially across the whorls, sometimes bifurcating or branching towards the outer margins. This ribbing not only provided structural strength to the shell but also influenced the hydrodynamic properties of the ammonite as it moved through the Jurassic seas.

The suture lines of Cardioceras are highly complex, with deeply incised lobes and saddles that make these ammonites both scientifically valuable and visually striking. This specimen exemplifies these key features, showing the evolutionary adaptations that allowed ammonites to thrive for millions of years.

Stratigraphic and Palaeontological Importance

Cardioceras is an important index fossil for the Oxfordian Stage, widely distributed across Europe, including Poland, France, Germany, and the United Kingdom. Its stratigraphic utility lies in its relatively short geological range, making it a reliable marker for dating Jurassic marine sediments. The fossil record of Cardioceras also provides valuable information on faunal migrations, evolutionary trends, and palaeoenvironmental changes during the Upper Jurassic.

Depositional Environment

During the Oxfordian, Poland was part of a shallow, warm sea with calm depositional environments that favoured fossil preservation. Layers of marl, limestone, and clay deposited in these conditions often contain rich assemblages of ammonites. Low oxygen conditions in some seabed areas slowed decay and reduced scavenging, allowing shells like this Cardioceras to remain intact and fossilise with exceptional detail.

Collectability and Display Value

This Cardioceras fossil ammonite from Poland is a rare and scientifically important specimen that makes a superb addition to any fossil collection. Its distinctive ribbing and historical significance as a stratigraphic marker enhance its appeal not only for collectors but also for educators and researchers. Whether displayed as a natural history treasure, used as a teaching specimen, or kept as part of a private collection, this ammonite embodies the enduring legacy of Jurassic marine life.

• Type: Fossil Ammonite – Cardioceras
• Age: Oxfordian, Upper Jurassic (~163–157 million years ago)
• Origin: Poland
• Scale: Rule squares/cube = 1 cm (see photographs for full sizing)
• Authenticity: 100% genuine specimen with Certificate of Authenticity
• Guarantee: The fossil shown is the exact specimen you will receive

A beautifully preserved ammonite, this specimen represents a direct connection to the Jurassic seas of Poland and a fascinating piece of natural history.