Cardioceras caelatum Fossil Ammonite Oxfordian Jurassic Frywald Poland Genuine Specimen COA

Description

This listing is for an authentic Cardioceras caelatum ammonite fossil from the Oxfordian stage of the Jurassic period, approximately 163–157 million years ago. Discovered in Frywald, Poland, this specimen represents a scientifically and historically significant ammonite from a region renowned for its Jurassic deposits. The fossil retains fine morphological features, including ribbing and coiling patterns that define the genus Cardioceras. The photographs provided show the actual specimen you will receive, with a 1 cm scale cube included for accurate measurement. Each of our fossils is carefully chosen, 100% genuine, and accompanied by a Certificate of Authenticity.

Geological Context

The Oxfordian stage belongs to the Upper Jurassic, a time when shallow seas spread across Europe, creating ideal conditions for marine life. In what is now Poland, the warm epicontinental seas deposited layers of limestone and marl rich in ammonites, belemnites, and other marine organisms. The Frywald locality is particularly well known for its Oxfordian ammonite fauna, which has been used in detailed biostratigraphic studies to define ammonite zones across Europe.

Fossils like Cardioceras caelatum are crucial in establishing the Cardioceratid biozones of the Oxfordian, making them highly valuable both scientifically and for collectors who appreciate their role in stratigraphy.

Morphological Features

This specimen of Cardioceras caelatum demonstrates the classic features of the genus:

• Shell form: A moderately involute shell, where inner whorls are partially hidden by the outer whorl.
• Ribbing: Strong, dense ribs radiating across the flanks, giving the ammonite a rugged and distinctive appearance.
• Keel: A well-defined ventral keel along the outer margin, characteristic of many Oxfordian ammonites.
• Sutures: Complex suture patterns that indicate the septal divisions inside the shell, visible along areas of preservation.

These structural adaptations suggest a nektonic lifestyle, with the ammonite actively swimming in open marine waters. The keel and ribbing provided both strength and improved hydrodynamic stability.

Scientific and Collector Significance

Cardioceras caelatum belongs to the order Ammonitida, superfamily Perisphinctoidea, and family Cardioceratidae. Ammonites of this group are particularly important for defining ammonite biozones in the Oxfordian, making them essential for paleontological research.

For collectors, this species offers not only scientific importance but also aesthetic appeal. The ribbed shell with its bold symmetry and strong ornamentation makes it a striking display fossil. Its provenance from Frywald, Poland, adds regional and historical interest, as this area is a classic site in Jurassic ammonite research.

Key Details

• Species: Cardioceras caelatum
• Age: Oxfordian, Upper Jurassic (~163–157 million years ago)
• Location: Frywald, Poland
• Order: Ammonitida
• Superfamily: Perisphinctoidea
• Family: Cardioceratidae
• Features: Ribbed shell, keel, involute whorls, visible sutures
• Authenticity: 100% genuine fossil with Certificate of Authenticity
• Scale cube: 1 cm (see photographs for accurate sizing)

This exceptional Oxfordian ammonite fossil from Frywald, Poland, represents both a scientifically significant specimen and a visually appealing collector’s piece. Its combination of ribbed morphology, historical provenance, and excellent preservation makes it an ideal addition for enthusiasts of paleontology, natural history, or rare Jurassic fossils.

Scale cube = 1 cm. Please see photographs for full sizing details.